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Note 6 - Accrued Retirement Benefits - Fair Values of Pension Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Fair value of pension plan assets | $ 47,176 | $ 56,434 | $ 64,341
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of pension plan assets |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value of pension plan assets | 47,176 | 56,434 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value of pension plan assets | 47,176 | 56,434 |
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 | 7,177 | 8,120 |
Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value of pension plan assets | 7,177 | 8,120 |
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 | 39,025 | 46,069 |
Fixed Income Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value of pension plan assets | 39,025 | 46,069 |
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 | 974 | 2,245 |
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value of pension plan assets | $ 974 | $ 2,245 |

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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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