Note 6 - Product Warranty (Details) - Product Warranty (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Product Warranty [Abstract]
Balance at beginning of period	$ 55	$ 50	$ 50	$ 50
Provisions	41	25	70	59
Warranty services provided, net	(31)	(25)	(55)	(59)
	$ 65	$ 50	$ 65	$ 50