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Note 16 - Employee Benefit Plans - Summary of Fair Values of Pension Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Fair value of plan assets | $ 34,398 | $ 33,838 | $ 35,126
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of plan assets | 17,639 | 18,849 |
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] |  |  |
Fair value of plan assets | 1,090 | 1,253 |
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | US Large Cap [Member] |  |  |
Fair value of plan assets | 5,845 | 6,105 |
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | US Mid Cap [Member] |  |  |
Fair value of plan assets | 1,343 | 891 |
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | US Small Cap [Member] |  |  |
Fair value of plan assets | 795 | 443 |
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | World Equity [Member] |  |  |
Fair value of plan assets | 1,484 | 1,095 |
Fair Value, Inputs, Level 1 [Member] | Real Estate [Member] |  |  |
Fair value of plan assets | 473 | 314 |
Fair Value, Inputs, Level 1 [Member] | Other Equity Securities [Member] |  |  |
Fair value of plan assets | 147 | 223 |
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member] |  |  |
Fair value of plan assets | 6,462 | 8,525 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value of plan assets | 16,759 | 14,989 |
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | US Large Cap [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | US Mid Cap [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | US Small Cap [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | World Equity [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Real Estate [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Other Equity Securities [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities [Member] |  |  |
Fair value of plan assets | $ 16,759 | $ 14,989 |

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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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