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Note 4 - Goodwill and Intangible Assets, Net (Details Textual) - Licensing Agreements [Member] - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 29, 2015
Maximum [Member]    
Amortization of Intangible Assets   $ 0.1
Amortization of Intangible Assets $ 1.4