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Accounts Receivable (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, beginning of period $ 144,921us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 121,583us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Provision for (recoveries of) doubtful accounts 44,178pmd_ProvisionForRecoveriesOfDoubtfulAccounts 82,332pmd_ProvisionForRecoveriesOfDoubtfulAccounts
Write-offs (93,574)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (58,994)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Balance, end of period $ 95,525us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 144,921us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent