Note 2 - Significant Accounting Policies - Earnings Per Share, Basic and Diluted (Details) - shares	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Common stock, issued (in shares)	24,324,576		24,324,576		23,784,363	23,573,057	22,855,964	22,089,650
Shares held by subsidiaries (Note 7) (in shares)	(704,309)	(704,309)	(704,309)	(704,309)
Common stock, outstanding (in shares)	23,620,267		23,620,267		23,080,054	22,868,748	22,151,655	21,385,341
Weighted average shares for fully vested stock bonuses (in shares)		675,000	289,051	642,701
Weighted average shares issued during the period (in shares)	268,927	62,308	249,827	560,510
Basic weighted average shares – end of period (in shares)	23,348,981	22,888,963	23,407,626	22,588,552