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Note 9 - Segments and Geographic Information (Details) - Summary of Geographic Sales (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Note 9 - Segments and Geographic Information (Details) - Summary of Geographic Sales [Line Items]    
Net Sales $ 4,919 $ 4,458
UNITED STATES
   
Note 9 - Segments and Geographic Information (Details) - Summary of Geographic Sales [Line Items]    
Net Sales 4,283 3,885
International [Member]
   
Note 9 - Segments and Geographic Information (Details) - Summary of Geographic Sales [Line Items]    
Net Sales $ 636 $ 573