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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

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