Note 2 - Significant Accounting Policies - Earnings Per Share, Basic and Diluted (Details) - shares	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2015
Common stock, issued (in shares)	23,784,363		23,784,363		23,761,168	23,573,057	22,606,852	22,089,650
Shares held by subsidiaries (Note 7) (in shares)	(704,309)	(704,309)	(704,309)	(704,309)
Common stock, outstanding (in shares)	23,080,054		23,080,054		23,056,859	22,868,748	21,902,543	21,385,341
Weighted average shares for fully vested stock bonuses (in shares)	260,870	652,989	430,435	626,495
Weighted average shares issued during the period (in shares)	10,770	29,469	137,128	425,203
Basic weighted average shares – end of period (in shares)	23,328,499	22,585,001	23,436,311	22,437,039