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Note 10 - Fair Value of Assets and Liabilities - Fair Value Measurements, Recorded (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Total assets at fair value	$ 55	$ 21
Embedded customer derivative	55
Total liabilities recorded at fair value	1,512	21
Embedded customer derivatives		21
Metal Swaps [Member]
Metal swaps	55
Fixed interest rate hedge		21
Interest Rate Swap [Member]
Fixed interest rate hedge	1,457
Fair Value, Inputs, Level 1 [Member]
Total assets at fair value
Embedded customer derivative
Total liabilities recorded at fair value
Embedded customer derivatives
Fair Value, Inputs, Level 1 [Member] | Metal Swaps [Member]
Metal swaps
Fixed interest rate hedge
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]
Fixed interest rate hedge
Fair Value, Inputs, Level 2 [Member]
Total assets at fair value	55	21
Embedded customer derivative	55
Total liabilities recorded at fair value	1,512	21
Embedded customer derivatives		21
Fair Value, Inputs, Level 2 [Member] | Metal Swaps [Member]
Metal swaps	55
Fixed interest rate hedge		21
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Fixed interest rate hedge	1,457
Fair Value, Inputs, Level 3 [Member]
Total assets at fair value
Embedded customer derivative
Total liabilities recorded at fair value
Embedded customer derivatives
Fair Value, Inputs, Level 3 [Member] | Metal Swaps [Member]
Metal swaps
Fixed interest rate hedge
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]
Fixed interest rate hedge

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
-Section 50
-Paragraph 2
-Subparagraph (a)
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- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other 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 assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
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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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
-Paragraph 4B
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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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Fair value of financial and nonfinancial obligations.

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