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Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Deferred tax assets:
Net operating loss carryforwards	$ 17,738	$ 15,976
Alternative minimum tax credit carryforwards		857
Accrued expenses and other timing	1,100	983
Total gross deferred tax assets	18,838	17,816
Less — valuation allowance	(18,903)	(17,518)
Net deferred tax assets	(65)	298
Deferred tax liabilities:
Property and equipment, principally due to differences in depreciation	65	(298)
Total gross deferred tax liabilities	65	(298)
Net deferred tax assets	$ 0	$ 0

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