Income Taxes - Deferred (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Components of deferred tax assets and liabilities
Accounts receivable	$ 43	$ 40
Inventories	314	443
Accrued liabilities	374	262
Stock based compensation expense	102	96
Intangibles	(454)	(300)
Property, plant and equipment	(539)	(484)
Revenue reserves	393	308
Other deferred tax liabilities	(613)	(408)
Deferred Tax Liabilities, Gross	(380)	(43)
Deferred Income Tax Liabilities, Net	$ (380)	$ (43)