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Note 7 - Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
December 31,
  
   
2017
    
2016
  
Commercial
   $
9,464
     $
9,228
  
U.S. Government
    
0
      
10
  
     
9,464
      
9,238
  
Allowance for doubtful accounts
    
(147
 )    
(1,228
 )
Net   $
9,317
     $
8,010