Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Deferred tax assets:
Federal, state, and foreign net operating loss carryovers	$ 271	$ 501
Stock option compensation	444	824
Accrued vacation, allowance for returns, bonuses & other	2,104	2,067
Gross deferred tax asset	2,819	3,392
Deferred tax liabilities:
Patents and trademarks	(99)	(117)
Property & equipment	(1,250)	(801)
Other	(189)	(59)
Gross deferred tax liabilities	(1,538)	(977)
Less: valuation allowance	(73)	(251)
Deferred tax assets, net	$ 1,208	$ 2,164