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Note 13 - Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Inventories $ 179,171 $ 164,768
Bad debts 5,009 4,659
Accrued liabilities 48,812 279,508
Prepaid expense (92,571) (116,524)
Depreciation and amortization (2,757,740) (2,798,040)
Research and development and other credit carryforwards 451,247 556,387
Right of use lease accounting 47,351  
Right of use lease accounting   (19,600)
Directors stock option plan 161,212 163,427
Total deferred tax liability (1,957,509) (1,765,415)
Valuation allowance (47,319) (47,319)
Reserve for uncertain tax positions (425,000) (395,000)
Total reserves & allowances (472,319) (442,319)
Net deferred tax liability, net of reserves $ (2,429,828) $ (2,207,734)