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Note 8 - Benefit Plans - Actual and Target Pension Plan Asset Allocation (Details) | Dec. 31, 2020 | Dec. 31, 2019
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Percentage of plan assets | 100.00% | 100.00%
Target allocation | 100.00% |
Equity Securities [Member] |  |
Percentage of plan assets | 0.00% | 68.00%
Target allocation | 60.00% |
Fixed Income Investments [Member] |  |
Percentage of plan assets | 40.00% | 31.00%
Target allocation | 40.00% |
Money Market Funds [Member] |  |
Percentage of plan assets | 60.00% | 0.00%
Target allocation | 0.00% |
Other than Securities Investment [Member] |  |
Percentage of plan assets | 0.00% | 1.00%
Target allocation | 0.00% |

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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: 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=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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