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Note 9 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred income tax assets: |  |
Allowance for doubtful accounts | $ 5,293 | $ 5,060
Inventory capitalization | 7,107 | 6,197
Depreciation and amortization |  |
Research & development tax credits | 588,096 | 413,680
Compensation costs | 202,287 | 356,983
Vacation accrual | 142,230 | 167,644
Interest expense carryforward | 144,340 | 66,149
Net operating loss carryforward | 1,798,315 | 832,565
Other items | 52,232 | 16,446
Total deferred tax asset | 2,939,900 | 1,864,724
Deferred incomes tax liability: |  |
Property and equipment - tax over book depreciation | (442,486) | (439,310)
Less valuation allowance | (2,497,414) |
Net long-term deferred tax asset |  | $ 1,425,414

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