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, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Net income (loss) available to common shareholders, basic	$ 63,161	$ (22,103)	$ 348,667	$ 849,601
Shares, basic (in shares)	29,559,139	29,559,139	29,559,139	29,559,139
Basic (in dollars per share)	$ 0	$ 0	$ 0.01	$ 0.03
Effect of dilutive securities, shares (in shares)	8,739,020		8,739,020	8,739,020
Effect of dilutive securities, per share (in dollars per share)
Net income (loss) available to common shareholders, diluted	$ 63,161	$ (22,103)	$ 348,667	$ 849,601
Shares, diluted (in shares)	38,298,159	29,559,139	38,298,159	38,298,159
Diluted (in dollars per share)	$ 0	$ 0	$ 0.01	$ 0.02