Note 5 - Goodwill, Intangible Assets and Long Term Assets (Details) - Composition of intangible assets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Assets	$ 3,566	$ 3,564
Net	3,566	3,564
Accumulated Amortization	7,853	7,615
Gross Assets	12,697	12,654
Net	4,844	5,039
Patented Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	4,505	4,495
Accumulated Amortization	3,822	3,702
Net	683	793
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	4,020	3,998
Accumulated Amortization	3,469	3,366
Net	551	632
Distributor Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	388	380
Accumulated Amortization	344	330
Net	44	50
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	218	217
Accumulated Amortization	$ 218	$ 217