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Note 5 - Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
    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