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Note 7 - Accounts Receivable
12 Months Ended
Dec. 31, 2018
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,
 
   
2018
   
2017
 
Commercial
  $
9,962
    $
9,464
 
Allowance for doubtful accounts
   
(81
)    
(147
)
Net
  $
9,881
    $
9,317