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Note 8 - Pension Plan Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Insurance General Account [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |
Insurance General Account [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 17,918 | $ 18,598
Insurance General Account [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |
Insurance General Account [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 17,918 | $ 18,598
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 1,273 |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | $ 2,319
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |
Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 1,273 | $ 2,319
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 37,621 |
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | $ 42,608
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |
Equity Securities [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 37,621 | $ 42,608
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 9,924 |
Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | $ 3,288
Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |
Fixed Income Securities [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 9,924 | $ 3,288
Real Estate [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 2,510 |
Real Estate [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |
Real Estate [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 2,510 |
Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets | 51,328 |
Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 17,918 | $ 66,813
Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 69,246 | $ 66,813

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + 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=49178875&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=58740216&loc=d3e1928-114920 + Details
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