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Income Taxes (Details 3) - USD ($)
Jun. 30, 2020
Jun. 30, 2019
Deferred tax assets:    
Net operating loss and credit carryforwards $ 16,039,000 $ 16,044,000
Stock-based compensation 868,000 822,000
R&D and other credits 2,108,000 2,014,000
Capitalized R&D expenses 487,000 476,000
Inventories 218,000 156,000
Accrued expenses and other 99,000 111,000
Gross deferred tax assets 19,819,000 19,623,000
Valuation allowance for deferred tax assets (17,044,000) (16,725,000)
Total deferred tax assets 2,775,000 2,898,000
Deferred tax liabilities:    
Depreciation and other (390,000) (277,000)
Intangible assets (1,726,000) (1,969,000)
Total deferred tax liabilities (2,116,000) (2,246,000)
Net deferred tax asset $ 659,000 $ 652,000