Note 7 - Income Taxes (Details) - Deferred Income Tax Assets (Liabilities) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Deferred Income Tax Assets (Liabilities) [Abstract]
Net operating loss carry forwards	$ 8,888	$ 5,059	$ 4,119
Capital loss and other credit carry forwards	57	178	21
Engineering credit carry forwards	1,412	1,244	1,148
Allowance for bad debts and returns	105	19	78
Inventory reserves	408	650	168
Capitalized inventory costs		17	16
Other accruals	849	500	514
Total gross deferred tax assets	11,719	7,667	6,064
Less valuation allowance on deferred tax assets	(11,717)	(7,654)	(6,034)
Net deferred tax assets	2	13	30
Marketable securities	(1)	(3)	(15)
Depreciation and other	(1)	(10)	(15)
Total deferred tax liabilities	$ (2)	$ (13)	$ (30)