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Note 7 - Capital Stock (Details Textual) - USD ($)
1 Months Ended 2 Months Ended 12 Months Ended
Nov. 10, 2017
Oct. 31, 2017
Feb. 29, 2016
May 31, 2015
Apr. 05, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 30, 2017
Mar. 31, 2016
Jun. 30, 2015
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           11,529,124 11,510,863        
Common Stock, Shares, Outstanding           6,160,889 6,396,803        
Preferred Stock, Shares Issued           0 0        
Treasury Stock, Value, Acquired, Cost Method           $ 6,348,000 $ 21,056,000 $ 19,278,000      
Treasury Stock, Shares           5,368,235 5,114,060        
Treasury Stock, Value           $ 129,183,000 $ 122,835,000        
Preferred Stock, Shares Outstanding           0 0        
The 2017 Tender Offer [Member]                      
Stock Repurchase Program, Number of Shares Authorized to be Repurchased   400,000                  
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   126,060                  
Treasury Stock, Shares, Acquired 143,859                    
Treasury Stock Acquired, Average Cost Per Share $ 30                    
Treasury Stock, Value, Acquired, Cost Method $ 4,400,000                    
The 2017 Tender Offer [Member] | Minimum [Member]                      
Treasury Stock Acquired Cost Per Share $ 27                    
The 2017 Tender Offer [Member] | Maximum [Member]                      
Treasury Stock Acquired Cost Per Share $ 30                    
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           110,316