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

Allowance for Credit Losses

 
   

Six Months Ended June 30, 2020

 

Allowance - beginning of period

  $ 486  

Provision for expected credit losses

    167  

Amounts written off against the allowance

    (10 )

Allowance - end of period

  $ 643