Note 10 - Intangible Assets (Details) - Other Intangible Assets (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	$ 2,700	$ 2,700
Intangible Assets, Accumulated Amortization	(1,711)	(1,568)
Intangible Assets, Net	989	1,132
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Useful Life	57 months	57 months
Intangible Assets, Gross	2,700	2,700
Intangible Assets, Accumulated Amortization	(1,711)	(1,568)
Intangible Assets, Net	$ 989	$ 1,132