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Note 3 - Receivables (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
    December 31,
    2017   2016
Accounts receivable–trade   $
22,033
     $
21,816
  
Less allowance for doubtful receivables    
(652
 )    
(567
 )
Receivables, net   $
21,381
     $
21,249