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Income Taxes (Schedule of Deferred Tax Assets and Liabilities, Net) (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Deferred Tax Assets    
Net operating loss and tax credits $ 16,964,685 $ 16,410,403
Property and equipment and intangibles 227,072 236,318
Allowance for accounts receivable 257,564 251,068
Reserve for expired product 469,466 558,484
Inventory 35,227 193,150
Deferred charges 845,765 910,577
Cumulative compensation costs incurred on deductible equity awards 1,047,149 884,049
Total deferred tax assets 19,846,928 19,444,049
Deferred Tax Liabilities    
Intangible assets (1,313,965) (1,974,787)
Net deferred tax assets, before valuation allowance 18,532,963 17,469,262
Less: deferred tax asset valuation allowance (18,511,161) (17,382,052)
Net deferred tax assets $ 21,802 $ 87,210