Note 8 - Stock Based Compensation - Unvested Restricted Stock Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares		1 Months Ended	3 Months Ended
Dec. 31, 2021	Mar. 31, 2022	Mar. 31, 2022	Mar. 31, 2021
Balance, Number of Unvested Shares of RSUs (in shares)			45,018	47,403
Balance, weighted-average grant date fair value (in dollars per share)			$ 27.49	$ 20.99
Granted,Number of Unvested Shares of RSUs (in shares)		1,044	1,044	38,308
Granted, weighted-average grant date fair value (in dollars per share)			$ 27.49	$ 21.15
Forfeited, Number of Unvested Shares of RSUs (in shares)			(4,102)
Forfeited, weighted-average grant date fair value (in dollars per share)			$ 27.49
Restricted Stock Units Converted, net of taxes (in shares)	(4,631)			(42,266)
Vested, weighted-average grant date fair value (in dollars per share)				$ 21.15
Balance, Number of Unvested Shares of RSUs (in shares)	45,018	41,960	41,960	43,445
Balance, weighted-average grant date fair value (in dollars per share)	$ 27.49	$ 27.49	$ 27.49	$ 20.98

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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