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Note A - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2011
Investments Classified by Contractual Maturity Date [Table Text Block]
    Maturities as of
December 31, 2011 		   Maturities as of
December 31, 2010 		 
    1 Year or Less     1 to 8 Years   1 Year or Less   1 to 5 Years  
Municipal bonds, U.S. Government and federal agency bonds   $ —     $ —   $ —   $ 16,542  
Corporate bonds     5,659       63,965     13,289     93,741  
Certificates of deposit     —       8,039     —     4,034  
                             
    $ 5,659     $ 72,004   $ 13,289   $ 114,317