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Note 18 - Pension and Postretirement Benefits - Summary of Asset Allocation and Target Allocation (Details)	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Target Allocation	100.00%
Percentage of Plan Assets	100.00%		100.00%
Equity Securities [Member]
Target Allocation	40.00%	40.00%	45.00%
Percentage of Plan Assets	40.00%		41.40%
Debt Securities [Member]
Target Allocation	60.00%	60.00%	55.00%
Percentage of Plan Assets	53.50%		52.90%
Real Estate [Member]
Target Allocation	0.00%
Percentage of Plan Assets	5.30%		5.00%
Other Contract [Member]
Target Allocation	0.00%
Percentage of Plan Assets	1.20%		0.70%

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
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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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
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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