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Note 12 - Other Income, Net (Details Textual) - Joint Marketing Agreement [Member] - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Recognized During the Current Year [Member]          
Other Nonrecurring Gain   $ 100,000 $ 0 $ 400,000 $ 0
Other Nonrecurring Gain $ 1,500,000        
Other Non-recurring Gain, Term of Recognition       3 years