Note 10 - Income Taxes - Reconciliation Schedule of Federal Income Tax Benefits (Details) - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Expected income tax benefit at statutory rate	$ (557,000)	$ (1,025,000)
State taxes, net of federal benefit	(97,000)	(110,000)
Deferred compensation		790,000
Permanent differences and other	2,000	3,000
Expiration of net operating allowances	850,000	1,201,000
Tax Cut and Jobs Act		(275,000)
Change in valuation allowance	(198,000)	(584,000)
Income tax benefit