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Income Taxes - Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Deferred tax assets:    
Net operating loss carryforwards $ 15,976 $ 20,439
Alternative minimum tax credit carryforwards 857 857
Accrued expenses and other timing 983 1,344
Total gross deferred tax assets 17,816 22,640
Less — valuation allowance (17,518) (22,195)
Net deferred tax assets 298 445
Deferred tax liabilities:    
Property and equipment, principally due to differences in depreciation (298) (445)
Total gross deferred tax liabilities (298) (445)
Net deferred tax assets (liabilities) $ 0 $ 0