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Income Taxes (Components of Net Deferred Income Tax Assets and Liabilities) (Details) - USD ($)
12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Income Tax Disclosure [Abstract]    
Deferred Tax Assets, Operating Loss Carryforwards $ 7,136,971 $ 7,028,242
Deferred Tax Expense from Stock Options Exercised 3,306 33,877
Deferred Tax Assets, Regulatory Assets and Liabilities 44,930 155,111
Deferred income tax liabilities:    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts 38,440 47,391
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits 54,631 70,084
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves 58,354 107,914
Deferred Tax Assets, Property, Plant and Equipment 323,570 290,921
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves 7,206 9,879
Deferred Tax Assets, Gross 7,667,408 7,743,419
Deferred Tax Assets, Valuation Allowance (7,607,765) (7,554,406)
Deferred Tax Assets, Net of Valuation Allowance 59,643 189,013
Deferred Tax Liabilities, Property, Plant and Equipment (11,108) (189,013)
Deferred Tax Liabilities, Leasing Arrangements (48,535) (167,459)
Deferred Tax Liabilities, Gross (59,643) (189,013)
Deferred Tax Assets, Net 0 0
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ (53,359) $ 95,065