Note 11 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total	$ (8,330,000)	$ (7,603,000)
Effective Income Tax Rate Reconciliation, Percent, Total	0.00%	0.00%
Current State and Local Tax Expense (Benefit)	$ 0	$ 0
Unrecognized Tax Benefits, Ending Balance	$ 400,000	$ 329,000	$ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Operating Loss Carryforwards, Valuation Allowance	$ 19,300,000
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax		$ 429,000
Operating Loss Carryforwards	80,500,000
Federal Operating Loss Carryforwards Available	38,200,000
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward One	$ 8,000,000.0
Tax Cuts and Jobs Act of 2017, Limits on Utilization of Net Operating Loss to Taxable Income Percentage	80.00%
Tax Credit Carryforward, Amount	$ 500,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	7,400,000
Unrecognized Tax Benefits Resulting in Net State Operating Loss Carryforwards	300,000
Unrecognized Tax Effect on Texas Business Loss Carryforwards	400,000
Deferred Tax Liabilities, Net, Total	13,000
Interest Expense For Uncertain Tax Positions	0	$ 0
Domestic Tax Authority [Member]
Tax Credit Carryforward, Amount	1,000,000.0
Indefinite Lives [Member]
Federal Operating Loss Carryforwards Available	42,300,000
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward One	$ 8,900,000