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Note 3 - Supplemental Balance Sheet Information (Detail) - Composition of intangible assets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Total intangible assets $ 12,654 $ 12,822
Total intangible assets 7,615 7,289
Total intangible assets 5,039 5,533
Trademarks [Member]
    
Trademarks 3,564 3,563
Patented Technology [Member]
    
Finite Lived Intangible Assets, Gross 4,495 4,492
Finite Lived Intangible Assets, Accumulated Amortization 3,702 3,440
Finite Lived Intangible Assets, Net 793 1,052
Customer Relationships [Member]
    
Finite Lived Intangible Assets, Gross 3,998 3,993
Finite Lived Intangible Assets, Accumulated Amortization 3,366 3,143
Finite Lived Intangible Assets, Net 632 850
Distributor Relationships [Member]
    
Finite Lived Intangible Assets, Gross 380 378
Finite Lived Intangible Assets, Accumulated Amortization 330 310
Finite Lived Intangible Assets, Net 50 68
Noncompete Agreements [Member]
    
Finite Lived Intangible Assets, Gross 217 396
Finite Lived Intangible Assets, Accumulated Amortization $ 217 $ 396