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Note 4 - Receivables
 12 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
(
4
)
Receivables
 
Receivables consist of the following (in thousands):
 
    December 31,
    2019   2018
Accounts receivable–trade   $
29,134
     $
28,885
  
Less allowance for doubtful receivables    
(486
 )    
(564
 )
Receivables, net   $
28,648
     $
28,321
  
 
Receivables are written off against these reserves in the period they are determined to be uncollectable, and payments subsequently received on previously written-off receivables are recorded as a reversal of the bad debt provision. The Company performs credit evaluations on its customers and obtains credit insurance on a large percentage of its accounts but does
not
generally require collateral. The Company recorded a net reversal of the provision for doubtful accounts of approximately
$52
thousand and
$50
thousand the years ended
December 
31,
2019
and
2018,
respectively.