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Note 5 - Retirement Plans - Pension Plan Asset Allocation (Details)	Dec. 31, 2021	Dec. 31, 2020
Asset allocation percentage	100.00%	100.00%
Defined Benefit Plan, Equity Securities [Member]
Asset allocation percentage	57.00%	63.00%
Defined Benefit Plan, Equity Securities [Member] | Minimum [Member]
Target Allocation	45.00%
Defined Benefit Plan, Equity Securities [Member] | Maximum [Member]
Target Allocation	55.00%
Defined Benefit Plan, Debt Security [Member]
Asset allocation percentage	42.00%	34.00%
Defined Benefit Plan, Debt Security [Member] | Minimum [Member]
Target Allocation	45.00%
Defined Benefit Plan, Debt Security [Member] | Maximum [Member]
Target Allocation	55.00%
Defined Benefit Plan, Real Estate [Member]
Asset allocation percentage	1.00%	3.00%
Defined Benefit Plan, Real Estate [Member] | Minimum [Member]
Target Allocation	0.00%
Defined Benefit Plan, Real Estate [Member] | Maximum [Member]
Target Allocation	2.00%

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 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

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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=123447040&loc=d3e1928-114920

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