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Note 12 - Income Taxes - Components of Income Tax Expense (Benefit) from Continuing Operations (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Current income taxes:    
Federal $ 0 $ 0
State 0 0
Current tax (benefit) 0 0
Book in excess of tax depreciation (386,673) (346,154)
Work in progress (442,964) (294,233)
Net operating loss carryover (402,448) (2,041,211)
Valuation allowance 1,128,197 2,319,705
Deferred compensation 0 (52,500)
Accrued interest 0 (13,125)
Discount amortization 84,190 464,744
Accrued vacation 0 (4,305)
Reserve for obsolete inventory (37,841) (88,915)
Deferred tax expense (benefit) (57,539) (55,994)
Total tax expense (benefit) (206,207) (237,410)
Danish Ministry of Taxation [Member]    
Current income taxes:    
Danish $ (148,668) $ (181,417)