Income Taxes - Deferred (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Jun. 30, 2021
Components of deferred tax assets and liabilities
Accounts receivable	$ 42	$ 43
Inventories	413	314
Accrued liabilities	454	374
Stock based compensation expense	179	102
Intangibles	(615)	(454)
Property, plant and equipment	(582)	(539)
Revenue reserves	466	393
Unrealized loss (gain) on marketable securities	90
Other deferred tax liabilities	(613)	(613)
Deferred Tax Liabilities, Gross	(166)	(380)
Deferred Income Tax Liabilities, Net	$ (166)	$ (380)