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Note 16 - Retirement Plans (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Contribution Plan, Administrative Expense | $ 2.6 | $ 2.2 | $ 2.0
Multiemployer Plans, Pension [Member] |  |  |
Multiemployer Plans, Funded Status | At least 80 percent |  |
Supplemental Employee Retirement Plan [Member] |  |  |
Defined Contribution Plan Vesting Period | 5 years |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 6.5 |  |
Supplemental Employee Retirement Plan [Member] | Minimum [Member] |  |  |
Defined Contribution Plan, Compensation Percentage Multiplier | 6.50% |  |
Supplemental Employee Retirement Plan [Member] | Maximum [Member] |  |  |
Defined Contribution Plan, Compensation Percentage Multiplier | 13.00% |  |
Non-union Flat Rolled Segments’ 401K Retirement Plan [Member] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 6.00% |  |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of administrative expense incurred by defined contribution plan. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Indicate whether the multiemployer plan is less than 65 percent funded, between 65 and less than 80 percent funded, or at least 80 percent funded. The acceptable values are: (1) "less than 65 percent", (2) "between 65 and less than 80 percent", (3) "at least 80 percent", and (4) "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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Balance Type: | na
Period Type: | duration

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- Definition A portion of the employee's compensation multiplied by a specific percentage. + References No definition available. + Details
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Balance Type: | na
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- Definition The vesting period of the employer's matching contributions to a defined contribution plan. + References No definition available. + Details
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- Details
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- Details
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Balance Type: |
Period Type: |

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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Data Type: | na
Balance Type: |
Period Type: |