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Note 21 - Weighted-average Assumptions Used to Determine the Net Benefit Obligations (Details) - Other Postretirement Benefits Plan [Member] | Dec. 31, 2020 | Dec. 31, 2019
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Weighted Average Assumptions Used To Determine Net Benefit Obligations [Line Items] |  |
Discount rate | 2.21% | 2.93%
Salary increase rate | 1.80% | 1.80%

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- Definition Weighted average assumptions used to determine the net benefit obligations. + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Details
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