Note 7 - Income Taxes - Deferred Income Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Deferred tax assets:
Net operating loss carry forwards	$ 11,207	$ 10,502	$ 8,888
Capital loss and other credit carry forwards	62	151	57
Engineering credit carry forwards	1,804	1,611	1,412
Allowance for bad debts and returns	10	40	105
Inventory reserves	1,106	1,280	$ 408
Capitalized inventory costs	41	$ 7
Stock Compensation	247
Other accruals	152	$ 513	$ 849
Total gross deferred tax assets	14,629	14,104	11,719
Less valuation allowance on deferred tax assets	(14,550)	(14,090)	(11,717)
Net deferred tax assets	$ 79	14	2
Deferred tax liabilities:
Marketable securities		(1)	(1)
Depreciation and other	$ (79)	(13)	(1)
Total deferred tax liabilities	$ (79)	$ (14)	$ (2)
Net deferred taxes