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Note I - Business Segment Information (Tables)
12 Months Ended
Dec. 31, 2012
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   
2012
   
%
   
2011
   
%
   
2010
   
%
 
United States
  $ 239,153       64     $ 241,405       67     $ 180,705       61  
Foreign countries
    136,538       36       118,085       33       116,103       39  
Total
  $ 375,691       100     $ 359,490       100     $ 296,808       100