Note 2 - Significant Accounting Policies - Earnings Per Share, Basic and Diluted (Details) - shares	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Shares issued – beginning of period (in shares)	28,068,688	25,939,892	24,748,213
Shares held by subsidiaries (Note 7) (in shares)		(704,309)	(704,309)
Shares outstanding – beginning of period (in shares)	27,364,379	25,235,583	24,043,904
Weighted average shares issued during the period (in shares)	1,286,743	395,155
Diluted weighted average shares – end of period (in shares)	26,522,326	24,439,059