Note 9 - Commitments and Contingencies (Details) - Warranty Reserve (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Warranty Reserve [Abstract]
Balance at beginning of period	$ 331	$ 561	$ 764
Warranty provision for product sales	476	917	870
Settlements made	(117)	(675)	(626)
Unused warranty provision	(239)	(472)	(447)
Balance at end of period	$ 451	$ 331	$ 561