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Note 9 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred income tax assets: |  |
Allowance for doubtful accounts | $ 12,926 | $ 35,442
Inventory capitalization | 6,620 | 6,969
Impairment Charge | 722,720 | 712,683
Research & development tax credits | 1,671,893 | 1,719,598
Compensation costs | 148,958 | 211,363
Vacation accrual | 141,079 | 89,626
Interest expense carryforward | 0 | 223,768
Net operating loss carryforward | 808,163 | 925,912
Other items | 94,235 | 12,248
Total deferred tax asset | 3,606,594 | 3,937,609
Deferred incomes tax liability: |  |
Property and equipment - tax over book depreciation | (616,501) | (556,476)
Less valuation allowance | (2,990,093) | (3,381,133)
Net long-term deferred tax asset | $ 0 | $ 0

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