Note 2 - Significant Accounting Policies - Earnings Per Share, Basic and Diluted (Details) - shares	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Shares issued – beginning of period (in shares)	28,417,602		28,068,688	25,939,892
Shares held by subsidiaries (Note 8) (in shares)			(704,309)	(704,309)
Shares outstanding – beginning of period (in shares)	27,713,293		27,364,379	25,235,583
Weighted average shares issued during the period (in shares)	102,433	424,147
Diluted weighted average shares – end of period (in shares)	27,466,812	25,659,730