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Note 8 - Fair Value of Assets and Liabilities - Fair Value Measurements, Recorded (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets: |  |
Derivative assets | $ 382 | $ 113
Embedded customer derivatives |  | 113
Liabilities: |  |
Embedded customer derivatives | 382 |
Total liabilities recorded at fair value | 387 | 149
Metal Swaps [Member] |  |
Assets: |  |
Derivative assets | 382 |
Liabilities: |  |
Derivative liabilities |  | 113
Interest Rate Swap [Member] |  |
Liabilities: |  |
Derivative liabilities | 5 | 36
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Derivative assets |  |
Embedded customer derivatives |  |
Liabilities: |  |
Embedded customer derivatives |  |
Total liabilities recorded at fair value |  |
Fair Value, Inputs, Level 1 [Member] | Metal Swaps [Member] |  |
Assets: |  |
Derivative assets |  |
Liabilities: |  |
Derivative liabilities |  |
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member] |  |
Liabilities: |  |
Derivative liabilities |  |
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Derivative assets | 382 | 113
Embedded customer derivatives |  | 113
Liabilities: |  |
Embedded customer derivatives | 382 |
Total liabilities recorded at fair value | 387 | 149
Fair Value, Inputs, Level 2 [Member] | Metal Swaps [Member] |  |
Assets: |  |
Derivative assets | 382 |
Liabilities: |  |
Derivative liabilities |  | 113
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |
Liabilities: |  |
Derivative liabilities | 5 | 36
Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Derivative assets |  |
Embedded customer derivatives |  |
Liabilities: |  |
Embedded customer derivatives |  |
Total liabilities recorded at fair value |  |
Fair Value, Inputs, Level 3 [Member] | Metal Swaps [Member] |  |
Assets: |  |
Derivative assets |  |
Liabilities: |  |
Derivative liabilities |  |
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member] |  |
Liabilities: |  |
Derivative liabilities |  |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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