Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Deferred tax assets:
Federal, state, and foreign net operating loss carryovers	$ 448	$ 574
Stock option compensation	1,262	1,367
Accrued vacation, allowance for returns, bonuses & other	2,672	2,615
Gross deferred tax asset	4,382	4,556
Deferred tax liabilities:
Patents and trademarks	(132)	(145)
Property & equipment	(1,194)	(823)
Other	(104)	(13)
Gross deferred tax liabilities	(1,430)	(981)
Less: valuation allowance	(259)	(320)
Deferred tax assets, net	$ 2,693	$ 3,255