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Note 16 - Employee Benefit Plans - Summary of Fair Values of Pension Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Fair value of plan assets | $ 33,838 | $ 35,126 | $ 38,038
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of plan assets | 18,849 | 19,952 |
Fair Value, Inputs, Level 1 [Member] | US Large Cap [Member] |  |  |
Fair value of plan assets | 6,105 | 7,065 |
Fair Value, Inputs, Level 1 [Member] | US Mid Cap [Member] |  |  |
Fair value of plan assets | 891 | 1,012 |
Fair Value, Inputs, Level 1 [Member] | US Small Cap [Member] |  |  |
Fair value of plan assets | 443 | 496 |
Fair Value, Inputs, Level 1 [Member] | World Equity [Member] |  |  |
Fair value of plan assets | 1,095 | 1,458 |
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |  |
Fair value of plan assets | 223 | 103 |
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member] |  |  |
Fair value of plan assets | 8,525 | 8,511 |
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] |  |  |
Fair value of plan assets | 1,253 | 1,001 |
Fair Value, Inputs, Level 1 [Member] | Real Estate [Member] |  |  |
Fair value of plan assets | 314 | 306 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value of plan assets | 14,989 | 15,174 |
Fair Value, Inputs, Level 2 [Member] | US Large Cap [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | US Mid Cap [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | US Small Cap [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | World Equity [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | 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 | 14,989 | 15,174 |
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Real Estate [Member] |  |  |
Fair value of plan assets | $ 0 | $ 0 |

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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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: 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=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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