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Note 11 - Income Taxes - Reconciliation of Income Tax Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
U.S. federal statutory income tax rate 21.00% 21.00% 21.00%
Expected income tax benefit $ (711) $ (724) $ (1,080)
Meals and entertainment 6 8 12
Non-deductible penalties 22 24 18
Change in estimate 28 (58) (178)
Incentive stock options 48 0 0
Research credit (52) 11 0
Change in valuation allowance 659 739 1,228
Income tax expense (benefit) $ 0 $ 0 $ 0