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Income Taxes (Schedule of deferred income tax assets and (liabilities) (Details) - USD ($)
Jun. 30, 2025
Jun. 30, 2024
Net deferred income tax assets (liabilities):    
Inventory capitalization for income tax purposes $ 21,864 $ 28,642
Inventory reserve 136,671 145,227
Accrued employee benefit reserve 31,067 40,164
Warranty reserve 26,108 29,720
Interest expense limitation 441,908 339,509
Allowance for credit losses and other 47,931 35,918
Property and equipment, principally due to differences in depreciation (144,592) (13,672)
Intangible assets 400,613 121,697
Research and development credit carryover 574,022 574,022
Deferred gain on sale lease-back 154,891 191,436
Operating loss carry forwards 5,993,596 5,388,117
Valuation allowance (7,686,550) (6,884,228)
Capitalized research and development 2,471 3,448
Total deferred income tax assets (liabilities) $ 0 $ 0