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Note E - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
Dec. 31, 2025
Dec. 31, 2024
Allowance for credit losses $ 3,605 $ 3,012
Inventories 6,720 6,886
Accounts payable 100,966 89,251
R&D expenses   206,069
Accrued expenses 243,493 306,381
Total deferred tax assets 354,784 611,599
Deferred tax liabilities    
Accounts receivable (336,852) (302,987)
Prepaid expenses (57,682) (58,171)
Depreciation on property, plant and equipment (153,879) (68,959)
Unrealized gain on marketable securities (13,617) (6,085)
Total deferred tax liabilities (562,030) (436,202)
Net deferred tax asset (207,246) (175,397)
Net deferred tax liability $ 207,246 $ 175,397