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Note 16 - Pension Plan - Assets Measured at Fair Value (Details) - Pension Plan [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Fair value of plan assets | $ 38,813 | $ 33,016 | $ 30,627
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of plan assets | 36,360 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value of plan assets | 2,453 |  |
Equity Funds [Member] |  |  |
Fair value of plan assets | 3,351 |  |
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of plan assets | 3,351 |  |
US Government Agencies Debt Securities [Member] |  |  |
Fair value of plan assets | 32,906 |  |
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of plan assets | 32,906 |  |
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value of plan assets |  |  |
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value of plan assets |  |  |
Cash [Member] |  |  |
Fair value of plan assets | 102 |  |
Cash [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of plan assets | 102 |  |
Other Plan Assets[Member] |  |  |
Fair value of plan assets | 2,453 |  |
Other Plan Assets[Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value of plan assets | $ 2,453 |  |

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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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