Note 2 - Significant Accounting Policies - Earnings Per Share, Basic and Diluted (Details) - shares	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Shares issued – beginning of period (in shares)	30,195,005	27,121,371	28,068,688	25,939,892
Shares held by subsidiaries (Note 8) (in shares)	(704,309)	(704,309)	(704,309)	(704,309)
Shares outstanding – beginning of period (in shares)	29,490,696	26,417,062	27,364,379	25,235,583
Weighted average shares issued during the period (in shares)	150,242	425,714	1,269,223	1,055,514
Diluted weighted average shares – end of period (in shares)	29,640,938	26,842,776	28,633,602	26,291,097