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Note 14 - Benefit Plans - Fair Value of Pension Plan's Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Fair values of the Pension Plan's assets | $ 46,488 | $ 43,985 | $ 45,452
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair values of the Pension Plan's assets | 37,860 | 40,310 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair values of the Pension Plan's assets | 8,628 | 3,675 |
Mutual Fund [Member] |  |  |
Fair values of the Pension Plan's assets | 37,860 | 40,310 |
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair values of the Pension Plan's assets | 37,860 | 40,310 |
Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair values of the Pension Plan's assets |  |  |
Other Investment [Member] |  |  |
Fair values of the Pension Plan's assets | 8,628 | 3,675 |
Other Investment [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair values of the Pension Plan's assets |  |  |
Other Investment [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair values of the Pension Plan's assets | $ 8,628 | $ 3,675 |

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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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