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Note 13 - Pension and Postretirement Benefits (Details Textual) | Mar. 31, 2021 | Dec. 31, 2020
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Equity Securities [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 50.00% | 55.00%
Debt Securities [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 50.00% | 45.00%

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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=123450688&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=123447040&loc=d3e1928-114920 + Details
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