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Note 9 - Capital Stock (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Jun. 08, 2018
May 08, 2018
Nov. 10, 2017
Oct. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Apr. 30, 2017
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, Total         11,612,144 11,529,124    
Common Stock, Shares, Outstanding, Ending Balance         5,956,558 6,160,889    
Preferred Stock, Shares Issued, Total         0 0    
Treasury Stock, Value, Acquired, Cost Method         $ 13,369,000 $ 6,348,000 $ 21,056,000  
Treasury Stock, Shares, Ending Balance         5,655,586 5,368,235    
Treasury Stock, Value, Ending Balance         $ 142,552,000 $ 129,183,000    
The 2018 Tender Offer [Member]                
Stock Repurchase Program, Number of Shares Authorized to be Repurchased   100,000            
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   124,248            
Treasury Stock, Shares, Acquired 185,597              
Treasury Stock Acquired, Average Cost Per Share $ 40              
Treasury Stock, Value, Acquired, Cost Method $ 7,500,000              
The 2018 Tender Offer [Member] | Minimum [Member]                
Treasury Stock Acquired Cost Per Share   $ 39            
The 2018 Tender Offer [Member] | Maximum [Member]                
Treasury Stock Acquired Cost Per Share   $ 43            
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          
September 2011 Reauthorization [Member]                
Stock Repurchase Program, Number of Shares Authorized to be Repurchased               500,000
Treasury Stock, Shares, Acquired         101,754 110,316