Note 3 - Balance Sheet Components (Details) - Roll-Forward of the Warranty Reserve (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Roll-Forward of the Warranty Reserve [Abstract]
Balance at beginning of period	$ 334	$ 275	$ 451	$ 331
Warranty provision for product sales	68	113	128	215
Settlements made		(3)	(74)	(95)
Unused warranty provision	(112)	(51)	(215)	(117)
Balance at end of period	$ 290	$ 334	$ 290	$ 334