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Income Taxes (Schedule of Deferred Tax Assets and Liabilities, Net) (Details) - USD ($)
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Deferred Tax Assets      
Net operating loss and tax credits $ 16,410,403   $ 15,295,547
Property and equipment and intangibles 236,318   232,667
Allowance for accounts receivable 251,068   129,180
Reserve for expired product 558,484   538,141
Inventory 193,150   173,885
Deferred charges 910,577   624,367
Cumulative compensation costs incurred on deductible equity awards 884,049   793,206
Total deferred tax assets 19,444,049   17,786,993
Deferred Tax Liabilities      
Intangible assets (1,974,787)   (2,067,548)
Net deferred tax assets, before valuation allowance 17,469,262   15,719,445
Less: deferred tax asset valuation allowance (17,382,052) $ (15,900,000) (15,632,235)
Net deferred tax assets $ 87,210   $ 87,210