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Note 4 - Stock Options Activity (Details) - USD ($)
shares in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Options Outstanding, Number (in shares) 76 221 333  
Options Outstanding, Weighted average exercise price (in dollars per share) $ 14.73 $ 14.98 $ 15.67  
Options Outstanding, Weighted average remaining contractual term 146 days 182 days 1 year 1 year 182 days
Options Forfeited, Number (in shares)   (100) (112)  
Options forfeited, Weighted average exercise price (in dollars per share)   $ 21.71 $ 17.14  
Options Outstanding, Number (in shares) 3 76 221 333
Options Outstanding, Weighted average exercise price (in dollars per share) $ 12.79 $ 14.73 $ 14.98 $ 15.67
Options Exercised, Number (in shares) (73) (45)    
Options Exercised, Weighted average exercise price (in dollars per share) $ 14.79 $ 13.64    
Options Outstanding, Aggregate Intrinsic Value $ 15,000 $ 945    
Options Exercisable, Number (in shares) 3      
Options Exercisable, Weighted average exercise price (in dollars per share) $ 12.79      
Options Exercisable, Weighted average remaining contractual term 146 days      
Options Exercisable, Aggregate Intrinsic Value $ 15,000