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Note 8 - Employee Benefit Plans (Details Textual) - Supplemental Employee Retirement Plan [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0.4	$ 0.4
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	1.2
Defined Benefit Plan, Benefit Obligation, Ending Balance	$ 22.7		$ 22.7

X

- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for 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 (a)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
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X

- Definition

Amount of contribution expected to be received by defined benefit plan from employer in remainder of current fiscal year. Excludes contribution previously paid by employer in current fiscal year.

+ References

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-Publisher FASB
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: