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Note 11 - Income Taxes - Reconciliation of Income Tax Rate (Details)
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Federal statutory rate 21.00% 21.00%
State and local taxes, net of federal benefit 2.00% 3.30%
Foreign operations 0.40% (0.30%)
Federal tax credits (0.70%) 0.80%
Valuation allowance (13.40%) 3.80%
Expiration of capital loss carryforward 8.90%
Uncertain tax position activity (0.50%) 0.30%
Stock-based compensation 3.60% (1.30%)
Tax rate changes (5.40%) (0.20%)
Other 2.10% (0.80%)
Effective tax rate 18.00% 26.60%