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Note 7 - Capital Stock (Details Textual) - USD ($)
 1 Months Ended 2 Months Ended 12 Months Ended
Feb. 29, 2016
May 31, 2015
Apr. 05, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2016
Jun. 30, 2015
May 31, 2014
Common Stock, Shares Authorized       40,000,000 40,000,000        
Common Stock, Par or Stated Value Per Share       $ 0.01 $ 0.01        
Preferred Stock, Shares Authorized       10,000,000 10,000,000        
Preferred Stock, Par or Stated Value Per Share       $ 0.01 $ 0.01        
Common Stock, Shares, Issued       11,510,863 11,497,471        
Common Stock, Shares, Outstanding       6,396,803 7,116,661        
Preferred Stock, Shares Issued       0 0        
Preferred Stock, Shares Outstanding       0 0        
Treasury Stock, Value, Acquired, Cost Method       $ 21,056,000 $ 19,278,000 $ 30,810,000      
Treasury Stock, Shares       5,114,060 4,380,180        
Treasury Stock, Value       $ 122,835,000 $ 101,779,000        
The 2016 Tender Offer [Member]                  
Stock Repurchase Program, Number of Shares Authorized to be Repurchased 325,000           425,000    
Stock Repurchase Program Additional Shares Authroized To Be Repurchased Percent Of Outstanding Shares Percent 2.00%                
Stock Repurchase Program Additional Shares Authorized To Be Repurchased Percent Of Outstanding Shares, Shares 142,413                
Treasury Stock, Shares, Acquired     567,413            
Treasury Stock Acquired, Average Cost Per Share     $ 31            
Treasury Stock, Value, Acquired, Cost Method     $ 17,700,000            
The 2016 Tender Offer [Member] | Minimum [Member]                  
Treasury Stock Acquired Cost Per Share $ 31                
The 2016 Tender Offer [Member] | Maximum [Member]                  
Treasury Stock Acquired Cost Per Share $ 34                
The 2015 Tender Offer [Member]                  
Stock Repurchase Program, Number of Shares Authorized to be Repurchased   80,000           150,000  
Stock Repurchase Program Additional Shares Authroized To Be Repurchased Percent Of Outstanding Shares Percent   2.00%              
Stock Repurchase Program Additional Shares Authorized To Be Repurchased Percent Of Outstanding Shares, Shares   148,566              
Treasury Stock Acquired Cost Per Share   $ 59              
Treasury Stock, Shares, Acquired   298,566              
Treasury Stock, Value, Acquired, Cost Method   $ 17,800,000              
The 2015 Tender Offer [Member] | Minimum [Member]                  
Treasury Stock Acquired Cost Per Share   $ 59              
The 2015 Tender Offer [Member] | Maximum [Member]                  
Treasury Stock Acquired Cost Per Share   $ 63              
September 2011 Reauthorization [Member]                  
Stock Repurchase Program, Number of Shares Authorized to be Repurchased                 500,000
Treasury Stock, Shares, Acquired       165,837 31,263 33,341