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Note C - Investments Available for Sale (Tables)
12 Months Ended
Dec. 31, 2012
Available-for-sale Securities [Table Text Block]
   
2011
 
Corporate Notes and Bonds
  $ 2,024  
Accrued interest income
    33  
Total investments available for sale
  $ 2,057  
Unrealized Gain (Loss) on Investments [Table Text Block]
   
2011
 
Gross unrealized holding losses                                                                                        
  $ 3  
Schedule of Comprehensive Income (Loss) [Table Text Block]
   
2012
   
2011
   
2010
 
Increase/(Decrease) in comprehensive income                                                                                    
  $ 1     $ (62 )   $ 36  
Realized Gains And Proceeds From Sale Of Investments [Table Text Block]
   
2012
   
2011
   
2010
 
Proceeds from sale of investments available for sale
  $ 1,013     $ 25,852     $ 6,002  
Realized gain on sale of investments available for sale
    0       13       0