Note 4 - Balance Sheet Components (Details) - Roll-Forward of the Warranty Reserve (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Roll-Forward of the Warranty Reserve [Abstract]
Balance at beginning of period	$ 290	$ 334	$ 451	$ 331
Warranty provision for product sales	78	130	207	349
Settlements made		(3)	(74)	(98)
Unused warranty provision	(128)	(78)	(344)	(199)
Balance at end of period	$ 240	$ 383	$ 240	$ 383