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Note 7 - Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
December 31,
 
   
2018
   
2017
 
Commercial
  $
9,962
    $
9,464
 
Allowance for doubtful accounts
   
(81
)    
(147
)
Net
  $
9,881
    $
9,317