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Note 6 - Accrued Retirement Benefits - Fair Values of Pension Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Fair value of pension plan assets | $ 32,103 | $ 43,587 | $ 44,284
Equity Funds [Member] |  |  |
Fair value of pension plan assets | 7,810 | 10,558 |
Fixed Income Funds [Member] |  |  |
Fair value of pension plan assets | 22,860 | 32,066 |
Money Market Funds [Member] |  |  |
Fair value of pension plan assets | 1,433 | 963 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of pension plan assets | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Equity Funds [Member] |  |  |
Fair value of pension plan assets | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Fixed Income Funds [Member] |  |  |
Fair value of pension plan assets | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |  |
Fair value of pension plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value of pension plan assets | 28,932 | 40,327 |
Fair Value, Inputs, Level 2 [Member] | Equity Funds [Member] |  |  |
Fair value of pension plan assets | 6,385 | 9,406 |
Fair Value, Inputs, Level 2 [Member] | Fixed Income Funds [Member] |  |  |
Fair value of pension plan assets | 21,114 | 29,958 |
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |  |  |
Fair value of pension plan assets | 1,433 | 963 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value of pension plan assets | 3,171 | 3,260 |
Fair Value, Inputs, Level 3 [Member] | Equity Funds [Member] |  |  |
Fair value of pension plan assets | 1,425 | 1,152 |
Fair Value, Inputs, Level 3 [Member] | Fixed Income Funds [Member] |  |  |
Fair value of pension plan assets | 1,746 | 2,108 |
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] |  |  |
Fair value of pension plan assets | $ 0 | $ 0 |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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