Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Income Taxes
Accounts receivable	$ 17	$ 17
Inventories	246	437
Accrued liabilities	250	233
Stock based compensation expense	36	15
Intangibles	(502)	(324)
R&D credit	378	781
Property, plant and equipment	(407)	(339)
Revenue reserves	319	0
Other deferred tax liabilities	(409)	(256)
Deferred Tax Liabilities, Gross	(72)
Deferred Tax Assets, Gross		(564)
Valuation allowance	0	0
Deferred Income Tax Liabilities, Net	$ (72)
Net deferred tax liabilities		$ 564