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Note 6 - Segment Information (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Note 6 - Segment Information (Details) [Line Items]        
Number of Reportable Segments     1  
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | North America [Member]
       
Note 6 - Segment Information (Details) [Line Items]        
Concentration Risk, Percentage 62.00% 96.00% 29.00% 97.00%