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Note 10 - Segment Information (Details Textual)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Number of Reportable Segments     1  
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | North America [Member]        
Concentration Risk, Percentage 58.00% 78.00% 73.00% 80.00%