Note 5 - Goodwill, Intangible Assets and Long Term Assets (Detail) - Composition of intangible assets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Gross Assets	$ 3,565	$ 3,564
Net	3,565	3,564
Gross Assets	12,666	12,654
Accumulated Amortization	7,724	7,615
Net	4,942	5,039
Patented Technology [Member]
Gross Assets	4,498	4,495
Accumulated Amortization	3,760	3,702
Net	738	793
Customer Relationships [Member]
Gross Assets	4,004	3,998
Accumulated Amortization	3,412	3,366
Net	592	632
Distributor Relationships [Member]
Gross Assets	382	380
Accumulated Amortization	335	330
Net	47	50
Noncompete Agreements [Member]
Gross Assets	217	217
Accumulated Amortization	$ 217	$ 217

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trademark to gain or protect exclusive use of a business name, symbol or other device or style for a projected indefinite period of benefit.

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