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Note 13 - Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Inventories $ 190,588 $ 179,171
Bad debts 5,549 5,009
Accrued liabilities 373,932 48,812
Prepaid expense (210,244) (92,571)
Depreciation and amortization (3,638,314) (2,757,740)
Research and development and other credit carryforwards 450,377 451,247
Right of use lease accounting 4,860 47,351
Directors stock option plan 185,201 161,212
Total deferred tax liability (2,638,051) (1,957,509)
Valuation allowance (47,319) (47,319)
Reserve for uncertain tax positions (590,000) (425,000)
Total reserves & allowances (637,319) (472,319)
Net deferred tax liability, net of reserves $ (3,275,370) $ (2,429,828)