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Note 4 - Accounts Receivable
 3 Months Ended
Mar. 31, 2012
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
4.     Accounts Receivable

The Company’s accounts receivable are comprised as follows:

   
March 31,
2012
   
December 31,
2011
 
Billed
  $ 27,692     $ 28,460  
Accrued and unbilled
    3,219       3,143  
Work-in-progress
    10,335       8,883  
Allowance for doubtful accounts and sales discounts
    (1,459 )     (1,455 )
                 
Accounts receivable, net
  $ 39,787     $ 39,031  

Unbilled receivables primarily represent revenues earned whereby those services are ready to be billed as of the balance sheet ending date.  Work-in-process primarily represents revenues earned under contracts which the Company is contractually precluded from invoicing until future dates as project milestones are realized.