Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Basic EPS:
Net income (loss)	$ (5,722)	$ (5,495)	$ (28,008)	$ 6,151	$ 12,812	$ 8,933	$ 3,932	$ 2,305	$ (33,074)	$ 27,982	$ (11,480)
Weighted average shares outstanding									26,621	26,891	26,769
Basic earnings (loss) per common share (in dollars per share)	$ (0.22)	$ (0.21)	$ (1.04)	$ 0.23	$ 0.48	$ 0.33	$ 0.15	$ 0.09	$ (1.24)	$ 1.04	$ (0.43)
Diluted EPS:
Weighted average shares outstanding									26,621	26,891	26,769
Dilutive stock options									0	28	0
Dilutive nonvested deferred shares									0	668	0
Diluted weighted average shares									26,621	27,587	26,769
Diluted earnings (loss) per common share (in dollars per share)	$ (0.22)	$ (0.21)	$ (1.04)	$ 0.22	$ 0.47	$ 0.33	$ 0.14	$ 0.08	$ (1.24)	$ 1.01	$ (0.43)