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Note D - Financing Arrangements (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 17, 2012
Oct. 01, 2010
Unsecured Debt $ 5,000,000 $ 10,000,000   $ 17,000,000 $ 35,000,000
Debt Instrument, Basis Spread on Variable Rate 0.75%       0.75%
Line of Credit Facility, Amount Outstanding 19,300,000 20,000,000      
Letters of Credit Outstanding, Amount 5,100,000        
Line of Credit Facility, Remaining Borrowing Capacity 4,900,000 5,000,000      
Interest Expense, Debt 122,000 179,000 175,000    
Operating Leases, Rent Expense 1.1 866,000 852,000    
LIBOR Rate Spread On Unsecured Bank Loan [Member]
          
Debt Instrument, Basis Spread on Variable Rate       0.75%  
Bank Line Of Credit Maturing November 2013 [Member]
          
Line of Credit Facility, Maximum Borrowing Capacity 20,000,000        
LIBOR Rate Spread On Bank Line Of Credit [Member]
          
Debt Instrument, Basis Spread on Variable Rate 0.75%        
Bank Line Of Credit Maturing November 2012 [Member]
          
Letters of Credit Outstanding, Amount 700,000        
Bank Line Of Credit Maturing May 2013 [Member]
          
Line of Credit Facility, Maximum Borrowing Capacity 10,000,000        
Bank Line Of Credit Maturing May 2012 [Member]
          
Letters of Credit Outstanding, Amount   $ 5,000,000