Note 12 - Commitments and Contingencies (Details) - Warranty Reserve - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Warranty Reserve [Abstract]
Balance at beginning of period	$ 240	$ 451	$ 331
Warranty provision for product sales	333	282	476
Settlements made	(158)	(42)	(117)
Unused warranty provision	(126)	(451)	(239)
Balance at end of period	$ 289	$ 240	$ 451