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Note 7 - Capital Stock (Details) (USD $)
 12 Months Ended 1 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2011
Dec. 31, 2012
Dec. 30, 2013
Tender Offer [Member]
Nov. 27, 2013
Tender Offer [Member]
Dec. 30, 2013
Tender Offer [Member]
Minimum [Member]
Dec. 30, 2013
Tender Offer [Member]
Maximum [Member]
Nov. 30, 2010
November 2010 [Member]
Dec. 31, 2011
September 2011 [Member]
Dec. 31, 2013
September 2011 [Member]
Sep. 30, 2011
September 2011 [Member]
Note 7 - Capital Stock (Details) [Line Items]                      
Common Stock, Shares Authorized 40,000,000   40,000,000                
Preferred Stock, Shares Authorized 10,000,000   10,000,000                
Common Stock, Shares, Issued 11,391,464   11,384,207                
Common Stock, Shares, Outstanding 7,983,539   8,701,607                
Preferred Stock, Shares Issued 0   0                
Preferred Stock, Shares Outstanding 0                    
Stock Repurchase Program, Number of Shares Authorized to be Repurchased         600,000     500,000     500,000
Treasury Stock, Shares, Acquired       675,000       500,000 224,000 50,325  
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, Amount         173,000            
Treasury Stock Acquired, Cost Per Share (in Dollars per share)       $ 20.50   $ 19.00 $ 21.00        
Treasury Stock, Value, Acquired, Cost Method (in Dollars) $ 14,452,000 $ 8,112,000   $ 13,900,000              
Treasury Stock, Shares 3,407,925   2,682,600                
Treasury Stock, Value (in Dollars) $ 51,691,000   $ 37,239,000