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Receivables (Tables)
 6 Months Ended
Jun. 30, 2020
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

Receivables consisted of the following:
 
June 30, 2020
 
December 31, 2019
Trade receivables
$
134

 
$
111

Income tax receivable
22

 
35

Other receivables
21

 
19

Allowance for doubtful accounts
(2
)
 
(1
)
Total
$
175

 
$
164