Net (Loss) Income Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Undistributed net (loss) income available to common stockholders										$ (74,054)	$ (18,652)	$ 22,524
Undistributed net (loss) income available to nonvested restricted stockholders and holders of convertible preferred stock										(76)	(17)	27
Undistributed net (loss) income available to common stockholders						$ 22,551				$ (74,130)	$ (18,669)	$ 22,551
Weighted average common shares outstanding - basic (in shares)										16,996,354	16,815,020	16,668,745
Shares issuable under stock options (in shares)										0	0	117,007
Weighted average common shares outstanding—diluted (in shares)						16,785,752				16,996,354	16,815,020	16,785,752
Net income (loss) per common share - basic (in US$ per share)	$ (0.52)	$ (3.05)	$ 0.00	$ (0.60)	$ (0.18)	$ 1.35	$ (0.14)	$ (1.03)	$ 0.05	$ (4.36)	$ (1.11)	$ 1.35
Net income (loss) per common share - diluted (in US$ per share)	$ (0.52)	$ (3.05)	$ 0.00	$ (0.60)	$ (0.18)	$ 1.34	$ (0.14)	$ (1.03)	$ 0.05	$ (4.36)	$ (1.11)	$ 1.34
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount										0	462,032	24,671
Cumulative Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount										407,734	393,769	0
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount										0	35,732	0