Note 3 - Basic and Diluted Net Income Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Net loss available to common shareholders	$ (1,830,770)	$ 2,158,248
Net loss available to common shareholders (in shares)	37,445,919	37,412,519
Net loss available to common shareholders (in dollars per share)	$ (0.05)	$ 0.06
Net loss available to preferred shareholders	$ (50,223)	$ 61,186
Net loss available to preferred shareholders (in shares)	1,027,240
Net loss available to preferred shareholders (in dollars per share)	$ (0.05)
Basic and diluted net loss per share	$ (1,880,993)	$ 2,219,434
Basic and diluted (in shares)	38,473,159	38,473,159
Basic and diluted (in dollars per share)	$ (0.05)	$ 0.06
Net income available to preferred shareholders (in shares)		1,060,640