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Note 9 - Segment Information (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | North America [Member]        
Concentration Risk, Percentage 90.00% 56.00% 84.00% 32.00%
Number of Reportable Segments     1