Note 2 - Significant Accounting Policies - Earnings Per Share, Basic and Diluted (Details) - shares	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Shares issued – beginning of period (in shares)	32,270,594	30,195,005	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)	31,566,285	29,490,696	30,704,696	27,364,379
Weighted average shares issued during the period (in shares)	1,353,526	150,242	919,613	1,269,223
Diluted weighted average shares – end of period (in shares)	32,919,811	29,640,938	31,624,309	28,633,602