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Income Taxes (Schedule of Deferred Tax Assets and Liabilities, Net) (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Deferred Tax Assets    
Net operating loss and tax credits $ 16,817,070 $ 16,961,650
Property and equipment and intangibles 222,893 227,056
Allowance for accounts receivable 83,931 249,483
Reserve for expired product 457,723 438,235
Inventory 104,824 100,362
Deferred charges 1,303,664 952,711
Cumulative compensation costs incurred on deductible equity awards 834,070 928,638
Total deferred tax assets 19,824,175 19,858,135
Deferred Tax Liabilities    
Intangible assets (62,253) (662,014)
Net deferred tax assets, before valuation allowance 19,761,922 19,196,121
Less: deferred tax asset valuation allowance (19,761,922) (19,196,121)
Net deferred tax assets $ 0 $ 0