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Note 3 - Revenue Recognition 1 (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Increase (Decrease) in Contract with Customer, Liability			$ (2,030)	$ (4,128)
Contract with Customer, Liability, Revenue Recognized	$ 444	$ 2,037	2,402	5,211
Accounts Receivable, Blenders' Tax Credit	13,084		13,084		$ 8,970
Accounts Receivable, Allowance for Credit Loss	67		67		48
Bill and Hold Arrangements [Member] | Four Customers [Member]
Contract with Customer, Liability	4,010		4,010		$ 4,473
Chemicals [Member]
Increase (Decrease) in Contract with Customer, Liability	$ 506	$ 733	$ 538	$ 733

X

- Definition

The amount of blenders' tax credit attributable to accounts receivable.

+ References

No definition available.

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X

- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(5))
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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X

- Definition

Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 912
-SubTopic 310
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-Section 45
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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