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Note 12 - Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Inventories $ 221,441 $ 190,588
Bad debts 5,757 5,549
Accrued liabilities 677,728 373,932
Prepaid expense (136,419) (210,244)
Depreciation and amortization (3,111,224) (3,638,314)
Capitalized Costs 629,085 0
Research and development and other credit carryforwards 443,689 450,377
Right of use lease accounting (80,376) 4,860
Directors stock option plan 180,761 185,201
Total deferred tax liability (1,169,558) (2,638,051)
Valuation allowance (39,000) (47,319)
Reserve for uncertain tax positions (176,000) (590,000)
Total reserves & allowances (215,000) (637,319)
Net deferred tax liability, net of reserves $ (1,384,558) $ (3,275,370)