Note 2 - Significant Accounting Policies - Earnings Per Share, Basic and Diluted (Details) - shares	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Shares issued – beginning of period (in shares)	25,939,892	24,748,213	23,573,057
Shares held by subsidiaries (Note 8) (in shares)		(704,309)	(704,309)
Shares outstanding – beginning of period (in shares)	25,235,583	24,043,904	22,868,748
Weighted average shares for fully vested stock bonuses (in shares)		177,534
Weighted average shares issued during the period (in shares)	395,155	413,649
Basic weighted average shares – end of period (in shares)	24,439,059	23,459,931