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Note 3 - Receivables
 12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
(
3
)
Receivables
 
Receivables consist of the following (in thousands):
 
    December 31,
    2017   2016
Accounts receivable–trade   $
22,033
     $
21,816
  
Less allowance for doubtful receivables    
(652
 )    
(567
 )
Receivables, net   $
21,381
     $
21,249
  
 
Receivables are written off against these reserves in the period they are determined to be uncollectible, 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 provision for doubtful accounts of approximately
$116,000
and
$126,000
for the years ended
December 
31,
2017
and
2016,
respectively.