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Income Taxes (Details 2) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Stock-based compensation $ 168,926us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost $ 160,850us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Allowance for doubtful accounts 33,585us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 48,578us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Accrued expenses 89,212us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 83,367us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
R&D tax credits 84,806us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment 0us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment
Deferred Tax Assets Gross 376,529us-gaap_DeferredTaxAssetsGross 292,795us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Prepaid expenses (44,565)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses 0us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Excess of tax over book depreciation and amortization (2,752,101)pmd_DeferredTaxLiabilitiesExcessOfTaxOverBookDepreciationAndAmortization (1,314,221)pmd_DeferredTaxLiabilitiesExcessOfTaxOverBookDepreciationAndAmortization
Deferred Tax Liabilities, Net (2,796,666)us-gaap_DeferredTaxLiabilities (1,314,221)us-gaap_DeferredTaxLiabilities
Net deferred tax liabilities $ (2,420,137)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (1,021,426)us-gaap_DeferredTaxAssetsLiabilitiesNet