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Note 11 - Income Taxes - Components of Income Tax Expense (Benefit) from Continuing Operations (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Current income taxes:    
Federal $ 0 $ 0
State 0 0
Current tax (benefit) 0 0
Book in excess of tax depreciation (346,154) (309,719)
Work in progress (294,233) (174,093)
Net operating loss carryover (2,041,211) (2,667,221)
Valuation allowance 2,319,705 2,811,619
Deferred compensation (52,500) 31,500
Accrued interest (13,125) 13,125
Discount amortization 464,744 175,420
Accrued vacation (4,305) 4,305
Reserve for obsolete inventory (88,915) 52,028
Deferred tax expense (benefit) (55,994) (63,036)
Total tax expense (benefit) (237,410) (63,036)
Danish Ministry of Taxation [Member]    
Current income taxes:    
Danish $ (181,417) $ 0