Net Income Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net income attributable to common stockholders—basic	$ 1,592	$ 1,190	$ 23,253	$ 5,673
Net income attributable to nonvested restricted stockholders	2	2	35	6
Net income	$ 1,594	$ 1,192	$ 23,288	$ 5,679
Weighted average common shares outstanding - basic (in shares)	16,605,754	16,539,479	16,584,125	16,486,469
Shares issuable under stock options (in shares)	116,020	107,936	120,075	127,806
Weighted average common shares outstanding—diluted (in shares)	16,721,774	16,647,415	16,704,200	16,614,275
Net income (loss) per common share - basic (in US$ per share)	$ 0.10	$ 0.07	$ 1.40	$ 0.34
Net income (loss) per common share - diluted (in US$ per share)	$ 0.10	$ 0.07	$ 1.39	$ 0.34