Note 2 - Significant Accounting Policies - Earnings Per Share, Basic and Diluted (Details) - shares	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Shares issued – beginning of period (in shares)	31,575,656	28,417,602	31,409,005	28,068,688
Shares held by subsidiaries (Note 7) (in shares)	(704,309)	(704,309)	(704,309)	(704,309)
Shares outstanding – beginning of period (in shares)	30,871,347	27,713,293	30,704,696	27,364,379
Weighted average shares issued during the period (in shares)	316,298	1,090,714	285,943	771,030
Diluted weighted average shares – end of period (in shares)	31,187,645	28,804,007	30,990,639	28,135,409