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Note 18 - Pension and Postretirement Benefits - Summary of Asset Allocation and Target Allocation (Details) | Dec. 31, 2020 | Dec. 31, 2019
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Target Allocation | 100.00% |
Percentage of Plan Assets | 100.00% | 100.00%
Equity Securities [Member] |  |
Target Allocation | 55.00% |
Percentage of Plan Assets | 52.50% | 53.70%
Debt Securities [Member] |  |
Target Allocation | 45.00% |
Percentage of Plan Assets | 40.00% | 37.90%
Other Contract [Member] |  |
Target Allocation | 0.00% |
Percentage of Plan Assets | 7.50% | 8.40%

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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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