Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Deferred tax assets:
Net operating loss carryforwards	$ 30,241		$ 24,569
Allowance for doubtful accounts	1,073		981
Inventory valuation reserves	1,057		827
Equity compensation	548		685
Goodwill	1,089		0
Accrued compensation	342		222
Foreign tax credit carryforward	4,041		3,955
Interest expense limitation	534		0
Other	50		0
Total gross deferred tax assets	38,975		31,239
Valuation allowance	(4,042)	$ (15,500)	(1,187)
Total deferred tax assets, net	34,933		30,052
Deferred tax liabilities:
Property and equipment	(6,613)		(6,216)
Intangible assets	(9,657)		(10,084)
Goodwill	0		(365)
Convertible debt	0		(619)
Unearned revenue	0		(52)
Prepaid insurance and other	0		(3)
Total gross deferred tax liabilities	(16,270)		(17,339)
Net deferred tax assets	$ 18,663		$ 12,713