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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