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Note 8 - Stockholders' Equity (Details) - Statement of Stockholders' Equity (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Note 8 - Stockholders' Equity (Details) - Statement of Stockholders' Equity [Line Items]            
Balance $ 771,627 $ 297,594 $ 771,627 $ 297,594 $ 735,237 $ 286,991
Net income (loss) 13,849 4,137 26,180 10,603    
Exercise of stock options     483      
Stock-based compensation     2,523      
Other     (65)      
Voting Common Stock [Member] | Common Stock [Member] | Performance Accelerated Restricted Stock Plan (PARS) [Member]
            
Note 8 - Stockholders' Equity (Details) - Statement of Stockholders' Equity [Line Items]            
Performance accelerated restricted stock     (92)      
Voting Common Stock [Member] | Common Stock [Member] | Deferred Stock Units (DSU) [Member]
            
Note 8 - Stockholders' Equity (Details) - Statement of Stockholders' Equity [Line Items]            
Director deferred stock units     7,361      
Voting Common Stock [Member] | Common Stock [Member]
            
Note 8 - Stockholders' Equity (Details) - Statement of Stockholders' Equity [Line Items]            
Balance 574,269 133,000 574,269 133,000 557,754 133,000
Conversion of non-voting to voting common stock     6,305      
Exercise of stock options     483      
Stock-based compensation     2,523      
Other     (65)      
Nonvoting Common Stock [Member] | Common Stock [Member]
            
Note 8 - Stockholders' Equity (Details) - Statement of Stockholders' Equity [Line Items]            
Balance 6,178   6,178   12,483  
Conversion of non-voting to voting common stock     (6,305)      
Accumulated Other Comprehensive Income (Loss) [Member]
            
Note 8 - Stockholders' Equity (Details) - Statement of Stockholders' Equity [Line Items]            
Balance 5,668 (987) 5,668 (987) 5,668 (987)
Retained Earnings [Member]
            
Note 8 - Stockholders' Equity (Details) - Statement of Stockholders' Equity [Line Items]            
Balance 186,642 166,233 186,642 166,233 161,076 154,936
Net income (loss)     25,566 11,297    
Noncontrolling Interest [Member]
            
Note 8 - Stockholders' Equity (Details) - Statement of Stockholders' Equity [Line Items]            
Balance (1,130) (652) (1,130) (652) (1,744) 42
Net income (loss)     614 (694)    
Performance Accelerated Restricted Stock Plan (PARS) [Member]
            
Note 8 - Stockholders' Equity (Details) - Statement of Stockholders' Equity [Line Items]            
Performance accelerated restricted stock     (92)      
Deferred Stock Units (DSU) [Member]
            
Note 8 - Stockholders' Equity (Details) - Statement of Stockholders' Equity [Line Items]            
Director deferred stock units     $ 7,361