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Debt and Other Financing Arrangements (Details Textual) (USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2014
Mar. 20, 2014
Aug. 08, 2014
Jun. 13, 2014
May 22, 2014
Mar. 24, 2014
Debt Instrument, Interest Rate, Effective Percentage 2.16%us-gaap_DebtInstrumentInterestRateEffectivePercentage          
Interest Expense $ 81,877us-gaap_InterestExpense          
Repayments of Debt 752,000us-gaap_RepaymentsOfDebt          
Equipment Loan Arrangement [Member]            
Debt Instrument, Unused Borrowing Capacity, Amount $ 7,000,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
/ us-gaap_LongtermDebtTypeAxis
= pmd_EquipmentLoanArrangementMember
$ 7,500,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
/ us-gaap_LongtermDebtTypeAxis
= pmd_EquipmentLoanArrangementMember
$ 999,626us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
/ us-gaap_LongtermDebtTypeAxis
= pmd_EquipmentLoanArrangementMember
$ 3,011,816us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
/ us-gaap_LongtermDebtTypeAxis
= pmd_EquipmentLoanArrangementMember
$ 1,935,241us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
/ us-gaap_LongtermDebtTypeAxis
= pmd_EquipmentLoanArrangementMember
$ 1,052,943us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
/ us-gaap_LongtermDebtTypeAxis
= pmd_EquipmentLoanArrangementMember
Long-term Debt, Description   Each note has a maturity date of 60 months from the applicable loan date, and bears interest at the then current 30-day LIBOR rate + 2.00%. Principal and interest are payable over the 60-month repayment period and principal is repayable without premium or penalty.        
Debt Instrument, Interest Rate, Effective Percentage 2.15%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= pmd_EquipmentLoanArrangementMember