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Note 8 - Retirement Plans - Pension Plan Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Defined benefit plan, fair value of plan assets | $ 80,929 | $ 69,246 | $ 66,813
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 18,357 | 17,918 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 62,572 | 51,328 |
Insurance General Account [Member] |  |  |
Defined benefit plan, fair value of plan assets | 18,357 | 17,918 |
Insurance General Account [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 18,357 | 17,918 |
Cash and Cash Equivalents [Member] |  |  |
Defined benefit plan, fair value of plan assets | 5,089 | 1,273 |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 5,089 | 1,273 |
Equity Securities [Member] |  |  |
Defined benefit plan, fair value of plan assets | 31,963 | 37,621 |
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 31,963 | 37,621 |
Fixed Income Securities [Member] |  |  |
Defined benefit plan, fair value of plan assets | 22,544 | 9,924 |
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined benefit plan, fair value of plan assets | 22,544 | 9,924 |
Real Estate [Member] |  |  |
Defined benefit plan, fair value of plan assets | 2,976 | 2,510 |
Real Estate [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined benefit plan, fair value of plan assets | $ 2,976 | $ 2,510 |

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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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