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Note 6 - Accounts Receivable
12 Months Ended
Dec. 31, 2015
Notes to Financial Statements  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
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6
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Accounts Receivable
 
Accounts receivable consists of the following (in thousands):
 
 
 
December 31,
 
 
 
2015
 
 
2014
 
Commercial
  $ 11,882     $ 47,228  
U.S. Government
    1,454       727  
      13,336       47,955  
Allowance for doubtful accounts
    (942 )     (289 )
    $ 12,394     $ 47,666