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Note 4 - Allowance for Credit Losses (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Accounts Receivable, Allowance for Credit Loss [Table Text Block]
  

Allowance for
Credit Losses

 
  

Nine Months Ended
September 30, 2020

 

Allowance - beginning of period

 $486 

Provision for expected credit losses

  182 

Amounts written off against the allowance

  (19)

Allowance - end of period

 $649