Note 3 - Basic and Diluted Net Income Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Net income (loss) available to common shareholders, basic	$ 75,884	$ 779	$ 424,551	$ 850,380
Shares, basic (in shares)	34,045,383	29,559,139	31,021,688	29,559,139
Basic income per share (in dollars per share)	$ 0	$ 0	$ 0.01	$ 0.03
Effect of dilutive securities, shares (in shares)	4,252,776	8,739,020	7,276,471	8,739,020
Effect of dilutive securities, per share (in dollars per share)
Net income (loss) available to common shareholders, diluted	$ 75,884	$ 779	$ 424,551	$ 850,380
Shares, diluted (in shares)	38,298,159	38,298,159	38,298,159	38,298,159
Diluted income (loss) per share (in dollars per share)	$ 0	$ 0	$ 0.01	$ 0.02