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Note 9 - Segment Information (Details Textual)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | North America [Member]        
Concentration Risk, Percentage 78.00% 19.00% 80.00% 26.00%
Number of Reportable Segments     1