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Note 6 - Accounts Receivable
12 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
(
6
)
Accounts Receivable
 
Accounts receivable consists of the following (in thousands):
 
   
December 31,
 
   
2019
   
2018
 
Commercial
  $
7,494
    $
9,962
 
Allowance for doubtful accounts
   
(50
)    
(81
)
Net
  $
7,444
    $
9,881