Note 2 - Significant Accounting Policies - Earnings Per Share, Basic and Diluted (Details) - shares	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Shares issued – beginning of period (in shares)	31,409,005	28,068,688
Shares held by subsidiaries (Note 7) (in shares)	(704,309)	(704,309)
Shares outstanding – beginning of period (in shares)	30,704,696	27,364,379
Weighted average shares issued during the period (in shares)	2,364,136	1,666,727
Diluted weighted average shares – end of period (in shares)	33,068,832	29,031,106