Note 7 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Income Tax Examination, Penalties and Interest Expense, Total	$ 0	$ 0
Unrecognized Tax Benefits, Ending Balance	0	$ 0
Domestic Tax Authority [Member]
Operating Loss Carryforwards Subject to Expiration	352,281
Operating Loss Carryforwards Not Subject to Expiration	545,245
State and Local Jurisdiction [Member] | Wisconsin Department of Revenue [Member]
Operating Loss Carryforwards, Total	6,358,000
State and Local Jurisdiction [Member] | State Departments of Revenue Other Than the Wisconsin Department of Revenue [Member]
Operating Loss Carryforwards, Total	$ 342,286