Note 2 - Significant Accounting Policies - Earnings Per Share, Basic and Diluted (Details) - shares	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Common stock, issued (in shares)	24,748,213	23,573,057	22,089,650
Shares held by subsidiaries (Note 7) (in shares)	(704,309)	(704,309)
Common stock, outstanding (in shares)	24,043,904	22,868,748	21,385,341
Weighted average shares for fully vested stock bonuses (in shares)	177,534	600,000
Weighted average shares issued during the period (in shares)	413,649	759,940
Basic weighted average shares – end of period (in shares)	23,459,931	22,745,281