Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Deferred tax assets:
Federal, state, and foreign net operating loss carryovers	$ 574	$ 536
Stock option compensation	1,367	1,531
Accrued vacation, allowance for returns, bonuses & other	2,615	3,173
Gross deferred tax asset	4,556	5,240
Deferred tax liabilities:
Patents and trademarks	(145)	(253)
Property & equipment	(823)	(588)
Other	(13)	0
Gross deferred tax liabilities	(981)	(841)
Less: valuation allowance	(320)	(312)
Deferred tax assets, net	$ 3,255	$ 4,087