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Allowance for Doubtful Accounts
12 Months Ended
Dec. 31, 2011
Notes to Financial Statements  
Allowance for Doubtful Accounts

 

3. Allowance for Doubtful Accounts

Changes in the allowance for doubtful accounts is composed of the following:

   Years Ended December 31,
   2011  2010  2009
          
Balance, beginning of year  $44   $44   $81 
Provision for doubtful accounts   —      17    5 
Uncollectible accounts written off   —      (17)   (42)
Balance, end of year  $44   $44   $44