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Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Inventories  
Major classes of inventory

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March 31,

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December 31,

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March 31,

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2020

    

2019

    

2019

    

 

Finished goods

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$

884

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$

872

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$

868

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Raw materials

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121

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128

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126

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Operating supplies

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42

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45

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44

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$

1,047

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$

1,045

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$

1,038

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