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Note 3 - Property and Equipment, Net (Details Textual) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Furniture and Fixtures [Member] | Equipment Not yet Placed into Service [Member]    
Property, Plant and Equipment, Gross $ 4,900 $ 4,800
Furniture and Fixtures [Member]    
Property, Plant and Equipment, Gross 38,231 45,840
Property, Plant and Equipment, Gross $ 139,538 $ 128,127