Note 2 - Significant Accounting Policies - Earnings Per Share, Basic and Diluted (Details) - shares	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Shares issued – beginning of period (in shares)	26,996,148		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)	26,291,839		25,235,583	24,043,904
Weighted average shares issued during the period (in shares)	424,147	23,189
Basic weighted average shares – end of period (in shares)	25,659,730	24,067,093