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Note 13 - Pension and Postretirement Benefits (Details Textual)	Mar. 31, 2022	Dec. 31, 2021
Equity Securities [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	45.00%	50.00%
Debt Securities [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	55.00%	50.00%

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 https://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 https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

+ Details

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Period Type:	instant

X

- Details

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X

- Details

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