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Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Inventories  
Major classes of inventory

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June 30,

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December 31,

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June 30,

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2020

    

2019

    

2019

    

 

Finished goods

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$

833

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$

872

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$

838

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Raw materials

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129

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128

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131

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Operating supplies

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42

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45

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46

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$

1,004

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$

1,045

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$

1,015

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