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Note 5 - Accounts Receivable
12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]

(5)           Accounts Receivable


Accounts receivable consists of the following (in thousands):


    December 31,    
   

2014

    2013  

Commercial

  $ 47,228     $ 36,245  

U.S. Government

    727       2,620  
      47,955       38,865  

Allowance for doubtful accounts

    (289 )     (332 )
    $ 47,666     $ 38,533  

Accounts receivable from the U.S. Government includes amounts due under long-term contracts, all of which are billed at December 31, 2014 and 2013, of $727,000 and $2,620,000 respectively.