Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Income Taxes
Accounts receivable	$ 40	$ 17
Inventories	374	246
Accrued liabilities	262	250
Stock based compensation expense	96	36
Intangibles	(300)	(502)
R&D credit	0	378
Property, plant and equipment	(484)	(407)
Revenue reserves	308	319
Other deferred tax liabilities	(408)	(409)
Deferred Tax Liabilities, Gross	(112)	(72)
Valuation allowance	0	0
Deferred Income Tax Liabilities, Net	$ (112)	$ (72)