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Note 13 - Fair Value Measurements (Details Textual) - USD ($)
3 Months Ended 8 Months Ended 12 Months Ended
Oct. 24, 2016
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Feb. 28, 2014
Convertible Debt, Fair Value Disclosures         $ 25,400,000  
Time Deposits, at Carrying Value           $ 53,000
Time Deposits, Annual Interest Rate           0.10%
Time Deposits, Interest Rate, Renewal Term 240 days          
Asset Impairment Charges     $ 0      
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)       $ 0    
Goodwill, Impairment Loss   $ 1,100,000   $ 0  
In Process Research and Development, Indefinite-Lived [Member]            
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   $ 22,600,000