Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended			9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019		Mar. 31, 2020	Mar. 31, 2019
Income Tax Expense (Benefit), Total	$ 6,104	$ (23,020)	[1]	$ 6,125	$ (22,995)	[1]
Tax Cuts and Jobs Act, Income Tax Expense (Benefit), Total		23,020			22,995
State and Local Jurisdiction [Member]
Income Tax Expense (Benefit), Total	6,104	0		6,125	0
Domestic Tax Authority [Member]
Income Tax Expense (Benefit), Total	$ 0	$ 0		$ 0	$ 0

[1] As adjusted for change in accounting principle (Note 2)