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Income Taxes (Schedule of Deferred Tax Assets and Liabilities, Net) (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Tax Assets |  |
Net operating loss and tax credits | $ 16,961,650 | $ 16,964,685
Property and equipment and intangibles | 227,056 | 227,072
Allowance for accounts receivable | 249,483 | 257,564
Reserve for expired product | 438,235 | 469,466
Inventory | 100,362 | 35,227
Deferred charges | 952,711 | 845,765
Cumulative compensation costs incurred on deductible equity awards | 928,638 | 1,047,149
Total deferred tax assets | 19,858,135 | 19,846,928
Deferred Tax Liabilities |  |
Intangible assets | (662,014) | (1,313,965)
Net deferred tax assets, before valuation allowance | 19,196,121 | 18,532,963
Less: deferred tax asset valuation allowance | (19,196,121) | (18,511,161)
Net deferred tax assets | $ 0 | $ 21,802

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