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Note 18 - Pension and Postretirement Benefits - Summary of Asset Allocation and Target Allocation (Details)	Dec. 31, 2020	Dec. 31, 2019
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%

X

- 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

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X

- 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

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