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Note 9 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred income tax assets: |  |
Allowance for doubtful accounts | $ 35,442 | $ 5,293
Inventory capitalization | 6,969 | 7,107
Impairment Charge | 712,683 |
Research & development tax credits | 1,719,598 | 588,096
Compensation costs | 211,363 | 202,287
Vacation accrual | 89,626 | 142,230
Interest expense carryforward | 223,768 | 144,340
Net operating loss carryforward | 925,912 | 1,798,315
Other items | 12,248 | 52,232
Total deferred tax asset | 3,937,609 | 2,939,900
Deferred incomes tax liability: |  |
Property and equipment - tax over book depreciation | (556,476) | (442,486)
Less valuation allowance | (3,381,133) | (2,497,414)
Net long-term deferred tax asset |  |

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