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Income Taxes (Details 1)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Federal statutory rate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit 1.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 5.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Permanent differences (4.30%)pmd_EffectiveIncomeTaxRateReconciliationPermanentDifferences (0.70%)pmd_EffectiveIncomeTaxRateReconciliationPermanentDifferences 0.10%pmd_EffectiveIncomeTaxRateReconciliationPermanentDifferences
Stock based compensation 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Effective tax rate 30.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations 34.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations 39.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations