Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Deferred tax assets:
Federal, state, and foreign net operating loss carryovers	$ 536	$ 519
Stock option compensation	1,531	1,098
Accrued vacation, allowance for returns, bonuses & other	3,173	3,081
Gross deferred tax asset	5,240	4,698
Deferred tax liabilities:
Patents and trademarks	(253)	(417)
Property & equipment	(588)	(722)
Gross deferred tax liabilities	(841)	(1,139)
Less: valuation allowance	(312)	(276)
Deferred tax assets, net	$ 4,087	$ 3,283