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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

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