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Note 10 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred income tax assets: |  |
Allowance for doubtful accounts | $ 5,060 | $ 773
Inventory capitalization | 6,197 | 6,813
Depreciation and amortization |  | 70,272
Research & development tax credits | 413,680 | 496,930
Compensation costs | 1,035,983 | 838,643
Vacation accrual | 167,644 | 179,309
Interest expense carryforward | 66,149 |
Net operating loss carryforward | 832,565 |
Capital loss carryforward | 16,446 | 16,446
Total deferred tax asset | 2,543,724 | 1,609,186
Deferred incomes tax liability: |  |
Property and equipment - tax over book depreciation | (439,310) |
Less valuation allowance |  |
Deferred income taxes | $ 2,104,414 | $ 1,609,186

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