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Schedule of significant components of deferred income taxes (Details) - USD ($)
Jun. 30, 2022
Jun. 30, 2021
Deferred tax assets (liabilities):    
Revenue recognition and accounts receivable reserves $ 917,000 $ 655,000
Accrued liabilities 325,000 297,000
Property and equipment (246,000) (218,000)
Finite-life intangible assets (41,000) (15,000)
Stock options 532,000 414,000
Tax credits 152,000 125,000
Accounting method change (140,000)
Valuation allowance on deferred taxes (152,000) (125,000)
Other 51,000 56,000
Net deferred tax assets $ 1,538,000 $ 1,049,000