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Note 7 - Stock-based Awards Note 10 - Operating Leases Note 11 - Debt and Other Financing Arrangements Note 13 - Business Segment Reporting Income Tax Disclosure [Text Block] Note 2 - Summary of Significant Accounting Policies - Summary of Useful Lives of Assets (Details) Note 2 - Summary of Significant Accounting Policies - Revenue by Major Source (Details) Note 2 - Summary of Significant Accounting Policies - Summary of Stock Compensation Expense by Income Statement Account (Details) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Note 2 - Summary of Significant Accounting Policies - Basic and Diluted Weighted Average Common Shares Outstanding (Details) Note 3 - Accounts Receivable - Summary of the Allowance for Doubtful Accounts (Details) us-gaap_LiabilitiesCurrent Total Current Liabilities Note 4 - Accrued Expenses - Summary of Accrued Expenses (Details) Note 5 - Income Taxes - Summary of Income Tax Provision (Details) Note 5 - Income Taxes - Reconciliation of Effective Rate with Federal Statutory Rate (Details) us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1 Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year) Note 5 - Income Taxes - Components of Net Deferred Tax Liabilities (Details) Note 7 - Stock-based Awards - Summary of Shares Granted Under the 2006 Incentive Plan (Details) Note 7 - Stock-based Awards - Stock Option Activity (Details) Note 7 - Stock-based Awards - Nonvested Award Activity (Details) Note 10 - Operating Leases - Maturities of Lease Liabilities (Details) Note 11 - Debt and Other Financing Arrangements - Schedule of Debt Repayments (Details) Note 13 - Business Segment Reporting - Revenue by Major Source (Details) Notes To Financial Statements Notes To Financial Statements [Abstract] us-gaap_LitigationSettlementAmountAwardedToOtherParty Litigation Settlement, Amount Awarded to Other Party Share-based Payment Arrangement, Option, Activity [Table Text Block] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) Foreign currency translation, net of taxes Foreign currency translation, net of taxes Proceeds from short-term investments us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber Outstanding & Unvested at beginning of period (in shares) Outstanding & Unvested at end of period (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) Shares issued – vested (in shares) Current portion of long-term debt Less current portion of long-term debt from equipment financing Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block] Exercisable, weighted average exercise price (in dollars per share) Exercisable, weighted average remaining contractual life (Year) us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Exercisable (in shares) pmd_LegalCostCapitalizedNet Legal Cost Capitalized, Net Represents the legal cost capitalized, net. 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May 13, 2021 [Member] Related to date. Computer Software, Intangible Asset [Member] March 16, 2021 [Member] Related to date. Net deferred tax assets Finite-Lived Intangible Assets by Major Class [Axis] Share-based Payment Arrangement [Text Block] Finite-Lived Intangible Assets, Major Class Name [Domain] us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation Tax withholding related to vested shares from employee stock plans pmd_EffectiveIncomeTaxRateReconciliationTaxCreditExpenseResearchPercent Federal R&D Credits Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credit (expense). January 25, 2021 [Member] Related to date. Settlement With Customer [Member] Related to settlement with customer. Enma Sagastume v. Psychemedics Corporation [Member] Related to Enma Sagastume v. Psychemedics Corporation. Company's Insurers [Member] Related to company's insurers. Award Type [Domain] Award Date [Axis] Award Date [Domain] Award Type [Axis] Net (loss) income Net (loss) income pmd_OtherNonoperatingExpenseSettlement Settlements Amount of expense related to nonoperating activities, classified as settlement. Share-based Payment Arrangement, Option [Member] pmd_IncreaseDecreaseInAccruedExpensesAndAccruedIncomeTaxes Accrued expenses The increase (decrease) during the reporting period in the aggregate amount of expenses and income taxes incurred but not yet paid. 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Customer One [Member] Information related to customer one. pmd_SoftwareDevelopmentCostCapitalized Software Development Cost Capitalized The software development cost capitalized as of the balance sheet date. Schedule of Stock Based Compensation Expense [Table Text Block] Laboratory Equipment [Member] Information related to laboratory equipment. Cash flows from investing activities: Accrued shipping expense Carrying value as of the balance sheet date of accrued shipping obligations. Provision for doubtful accounts Represents the provision for (recoveries of) doubtful accounts. Basis of Presentation and Consolidation, Policy [Policy Text Block] Disclosure of accounting policy for the basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). In addition, discloses the accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary. BRAZIL Permanent differences The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to permanent differences. 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Converted to common stock, weighted average price per share (in dollars per share) Weighted average price at which the instruments, excluding stock (or unit) options, that were converted to common stock during the reporting period us-gaap_OperatingExpenses Total Operating Expenses Cancelled, weighted average price per share (in dollars per share) Weighted average price at which grantees could have acquired the underlying shares with respect to equity instrument other than stock options that were cancelled. us-gaap_DebtInstrumentTerm Debt Instrument, Term (Month) us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount Defined Contribution Plan, Employer Discretionary Contribution Amount General & administrative us-gaap_CashEquivalentsAtCarryingValue Cash Equivalents, at Carrying Value, Total Cash Cash and Cash Equivalents, at Carrying Value, Ending Balance Equipment Loan Arrangement [Member] Information related to the Equipment Loan Arrangement. us-gaap_AllocatedShareBasedCompensationExpense Stock compensation expense Banc of America Leasing and Capital [Member] Informaiton related to an equipment financing agreement with Banc of America Leasing and Capital LLC. Amendment Flag Auditor Name Auditor Location Auditor Firm ID Other Comprehensive (Loss) Income: us-gaap_ComprehensiveIncomeNetOfTax Total Comprehensive (Loss) Income City Area Code Use of Estimates, Policy [Policy Text Block] New Accounting Pronouncements, Policy [Policy Text Block] us-gaap_SharesOutstanding Balance (in shares) Balance (in shares) us-gaap_LongTermDebtWeightedAverageInterestRateOverTime Long-term Debt, Weighted Average Interest Rate, over Time Common stock, shares outstanding (in shares) us-gaap_DebtWeightedAverageInterestRate Debt, Weighted Average Interest Rate Preferred stock, shares outstanding (in shares) Other Foreign Countries [Member] Information related to other foreign countries. 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us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive 2026 Fair Value of Financial Instruments, Policy [Policy Text Block] us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths 2022 us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo 2023 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths Finite-Lived Intangible Asset, Expected Amortization, Year One Share-based Payment Arrangement, Employee [Member] Foreign Currency Transactions and Translations Policy [Policy Text Block] Lessee, Operating Lease, Liability, Maturity [Table Text Block] Other assets Stock compensation expense Share-based Payment Arrangement, Nonemployee [Member] us-gaap_FiniteLivedIntangibleAssetUsefulLife Finite-Lived Intangible Asset, Useful Life (Year) Earnings Per Share, Policy [Policy Text Block] us-gaap_AdjustmentForAmortization Amortization, Total Operating Expenses: Income Tax, Policy [Policy Text Block] Research, Development, and Computer Software, Policy [Policy Text 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Research and Development Expense [Member] Income Statement Location [Axis] Income Statement Location [Domain] Difference in tax rate for carryback claim Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in tax rate for carryback claim. PPP Loan expenses Amount before allocation of valuation allowances of deferred tax asset attributable to deductible PPP loan expenses. 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