Earnings per Common Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share, Basic [Abstract]
Net income (loss)	$ 3,932	$ 4,532	$ 6,237	$ 8,356
Weighted average shares outstanding - basic (shares)	27,043	26,771	26,982	26,713
Basic EPS (US$ per share)	$ 0.15	$ 0.17	$ 0.23	$ 0.31
Earnings Per Share, Diluted [Abstract]
Dilutive stock options	27	34	29	24
Dilutive nonvested deferred shares	512	273	617	196
Diluted weighted average shares (shares)	27,582	27,078	27,628	26,933
Diluted EPS (US$ per share)	$ 0.14	$ 0.17	$ 0.23	$ 0.31