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Note 9 - Fair Value of Assets and Liabilities - Fair Value Measurements, Recorded (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Embedded customer derivative	$ 69
Total assets at fair value	69
Total liabilities recorded at fair value	3,838	$ 5,620
Interest Rate Swap [Member]
Derivative liability	3,769	5,620
Metal Swaps [Member]
Derivative liability	69
Fair Value, Inputs, Level 1 [Member]
Embedded customer derivative	0
Total assets at fair value	0
Total liabilities recorded at fair value	0	0
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]
Derivative liability		0
Fair Value, Inputs, Level 1 [Member] | Metal Swaps [Member]
Derivative liability	0
Fair Value, Inputs, Level 2 [Member]
Embedded customer derivative	69
Total assets at fair value	69
Total liabilities recorded at fair value	3,838	5,620
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Derivative liability	3,769	5,620
Fair Value, Inputs, Level 2 [Member] | Metal Swaps [Member]
Derivative liability	69
Fair Value, Inputs, Level 3 [Member]
Embedded customer derivative	0
Total assets at fair value	0
Total liabilities recorded at fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]
Derivative liability		$ 0
Fair Value, Inputs, Level 3 [Member] | Metal Swaps [Member]
Derivative liability	$ 0

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
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-Paragraph 2
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X

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 210
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- Definition

Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as an asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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X

- Definition

Fair value of financial and nonfinancial obligations.

+ References

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