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Note 5 - Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Finite-Lived Intangible Assets, Amortization Expense, Year Three $ 100   $ 100    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 100   100    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 100   100    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 100   100    
Goodwill 85,488   85,488   $ 85,488
Amortization of Intangible Assets 30 $ 60 60 $ 90  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 100   100    
Finite-Lived Intangible Assets, Amortization Expense, after Year Five $ 50   $ 50