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Income Taxes (Details 3) - USD ($)
Jun. 30, 2021
Jun. 30, 2020
Deferred tax assets:    
Net operating loss and credit carryforwards $ 13,585,000 $ 16,039,000
Stock-based compensation 563,000 868,000
R&D and other credits 2,177,000 2,108,000
Capitalized R&D expenses 564,000 487,000
Inventories 253,000 218,000
Accrued expenses and other 347,000 99,000
Gross deferred tax assets 17,489,000 19,819,000
Valuation allowance for deferred tax assets (15,644,000) (17,044,000)
Total deferred tax assets 1,845,000 2,775,000
Deferred tax liabilities:    
Depreciation and other (255,000) (390,000)
Intangible assets (1,443,000) (1,726,000)
Total deferred tax liabilities (1,698,000) (2,116,000)
Net deferred tax asset $ 147,000 $ 659,000