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Note 4 - Inventory (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Effect of LIFO Inventory Liquidation on Income	$ 2,124	$ 0

X

- Definition

The effect of liquidating LIFO (last in first out) inventory layers on income.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SAB Topic 11.F)
-URI https://asc.fasb.org/extlink&oid=27011343&loc=d3e100079-122729

+ Details

Name:	us-gaap_EffectOfLIFOInventoryLiquidationOnIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration