Note 2 - Significant Accounting Policies - Earnings Per Share, Basic and Diluted (Details) - shares	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Shares issued – beginning of period (in shares)	28,417,602	26,996,148	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)	27,713,293	26,291,839	27,364,379	25,235,583
Weighted average shares issued during the period (in shares)	1,090,714	90,939	771,030	785,681
Diluted weighted average shares – end of period (in shares)	28,804,007	26,382,778	28,135,409	26,021,264