Note 3 - Basic and Diluted Net Income Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Net income (loss) available to common shareholders, basic	$ (74,914)	$ 63,161	$ (20,022)	$ 348,667
Shares, basic (in shares)	37,412,519	29,559,139	37,368,769	29,559,139
Basic income per share (in dollars per share)	$ 0	$ 0	$ 0	$ 0.01
Effect of dilutive securities, shares (in shares)		8,739,020		8,739,020
Effect of dilutive securities, per share (in dollars per share)
Net income (loss) available to common shareholders, diluted	$ (74,914)	$ 63,161	$ (20,022)	$ 348,667
Shares, diluted (in shares)	37,412,519	38,298,159	37,368,769	38,298,159
Diluted income (loss) per share (in dollars per share)	$ 0	$ 0	$ 0	$ 0.01
Net income (loss) available to common shareholders, diluted	$ (74,914)	$ 63,161	$ (20,022)	$ 348,667