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Income Taxes (Schedule of deferred income tax assets and (liabilities) (Details) - USD ($)
Jun. 30, 2023
Jun. 30, 2022
Net deferred income tax assets (liabilities):    
Inventory capitalization for income tax purposes $ 43,155 $ 72,773
Inventory reserve 120,153 91,016
Accrued employee benefit reserve 43,088 60,773
Warranty reserve 28,016 47,321
Accrued bonus and deferred payroll tax 0 136,384
Interest expense limitation 233,416 203,342
Allowance for doubtful accounts and other 85,351 114,130
Property and equipment, principally due to differences in depreciation 27,883 (34,830)
Research and development credit carryover 574,022 467,701
Deferred gain on sale lease-back 224,777 258,790
Operating loss carry forwards 4,719,831 3,585,760
Valuation allowance (6,104,053) (5,003,159)
Capitalized research and development 4,361 0
Total deferred income tax assets (liabilities) $ 0 $ 0