Note 11 - Income Taxes - Reconciliation of Income Tax Rate (Details)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Federal statutory tax rate	21.00%	27.60%
State and local taxes, net of federal benefit	3.30%	1.10%
Foreign operations	(0.30%)
Federal tax credits	0.80%	0.90%
Valuation allowance	3.80%	3.50%
Domestic production activities deduction		0.60%
Uncertain tax position activity	0.30%	0.40%
Shared based compensation	(1.30%)	(1.30%)
Tax rate changes	(0.20%)	(14.20%)
Other	(0.80%)	(2.30%)
Effective tax rate	26.60%	16.30%