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Note 1 - General (Details Textual)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Jan. 01, 2017
USD ($)
Dec. 31, 2016
USD ($)
Operations Commenced Date Jan. 01, 2005      
Subsidiary or Equity Method Investee, Number 7      
Entity Incorporation, Date of Incorporation Nov. 24, 2004      
Gain (Loss) on Foreign Currency Fair Value Hedge Derivatives $ 265 $ (72)    
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]        
Net Operating Losses Related to Excess Tax Benefit       $ 7,131
State and Local Jurisdiction [Member]        
Net Operating Losses Related to Excess Tax Benefit       $ 718
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member]        
Cumulative Effect of New Accounting Principle in Period of Adoption $ 0   $ 2,616