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Note 6 - Accrued Retirement Benefits - Fair Values of Pension Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair value of pension plan assets |  |
Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair value of pension plan assets | $ 8,120 | $ 9,884
Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair value of pension plan assets | $ 8,120 | $ 9,884
Fixed Income Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair value of pension plan assets |  |
Fixed Income Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair value of pension plan assets | $ 46,069 | $ 51,483
Fixed Income Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair value of pension plan assets | $ 46,069 | $ 51,483
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair value of pension plan assets |  |
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair value of pension plan assets | $ 2,245 | $ 2,974
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair value of pension plan assets | $ 2,245 | $ 2,974
Fair Value, Inputs, Level 1 [Member] |  |
Fair value of pension plan assets |  |
Fair Value, Inputs, Level 2 [Member] |  |
Fair value of pension plan assets | $ 56,434 | $ 64,341
Fair Value, Inputs, Level 3 [Member] |  |
Fair value of pension plan assets | 56,434 | 64,341
Fair value of pension plan assets | $ 56,434 | $ 64,341

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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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