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Note 1 - Summary of Significant Accounting Policies - Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Finished Goods	$ 29,996	$ 31,863
Work in Process	15,811	16,508
Raw Material, Fuel and Supplies	52,345	49,480
Total Inventories	$ 98,152	$ 97,851

X

- Definition

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

+ References

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-Publisher FASB
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-Topic 330
-SubTopic 10
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X

- Definition

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

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X

- Definition

Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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-SubTopic 10
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