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Note 7 - Accounts Receivable
 12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
(
7
)
Accounts Receivable
 
Accounts receivable consists of the following (in thousands):
 
 
 
December 31,
 
 
 
2016
 
 
2015
 
Commercial
   $
9,228
     $
11,882
  
U.S. Government
    
10
      
1,454
  
     
9,238
      
13,336
  
Allowance for doubtful accounts
    
(1,228
 )    
(942
 )
Net
   $
8,010
     $
12,394