Quarterly report [Sections 13 or 15(d)]

Contracts in Progress (Billings in Excess of Costs and Estimated Earnings) (Details)

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Contracts in Progress (Billings in Excess of Costs and Estimated Earnings) (Details) - USD ($)
Mar. 31, 2026
Dec. 31, 2025
Contracts in Progress [Abstract]    
Billings to date $ 3,200,915 $ 3,828,333
Costs incurred on uncompleted contracts 825,092 1,001,817
Estimated earnings 1,026,678 1,162,649
Cost plus estimated earnings 1,851,770 2,164,466
Billings in excess of costs plus estimated earnings on uncompleted contracts $ 1,349,145 $ 1,663,867