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Note N - Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jul. 09, 2015
May. 22, 2015
Jun. 30, 2015
Jun. 23, 2015
Note N - Subsequent Events (Details) [Line Items]        
Stock Repurchase Program, Number of Shares Authorized to be Repurchased   80,000   150,000
Treasury Stock, Shares, Acquired     0  
Treasury Stock, Value, Acquired, Cost Method (in Dollars)     $ 174  
Subsequent Event [Member]        
Note N - Subsequent Events (Details) [Line Items]        
Treasury Stock, Acquired Cost Per Share (in Dollars per share) $ 59.00      
Treasury Stock, Shares, Acquired 298,566      
Treasury Stock, Value, Acquired, Cost Method (in Dollars) $ 17,600      
Subsequent Event [Member] | Oversubscribed Shares Tendered [Member]        
Note N - Subsequent Events (Details) [Line Items]        
Treasury Stock, Shares, Acquired 148,566      
Maximum [Member]        
Note N - Subsequent Events (Details) [Line Items]        
Treasury Stock, Acquired Cost Per Share (in Dollars per share)   $ 63