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Note 8 - Income Taxes - Reconciliation of Income Tax Rate (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Stock-based compensation $ 74,635 $ 79,109
Stock-based compensation, percent 1.90% 23.40%
Other $ (54,744) $ (61,874)
Other, percent (1.40%) (18.30%)
Total income taxes $ 966,796 $ 87,500
Income tax on income 24.30% 25.90%
Domestic Tax Jurisdiction [Member]    
Tax at statutory rates $ 961,980 $ 86,592
Tax at statutory rates, percent 24.20% 25.60%
Depletion $ (9,799) $ (10,612)
Depletion, percent (0.30%) (3.10%)
State and Local Jurisdiction [Member]    
Depletion $ (5,276) $ (5,715)
Depletion, percent (0.10%) (1.70%)