Note 12 - Equity Plans - Restricted Stock Unit Activity (Details) - $ / shares	3 Months Ended	12 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Outstanding at December 31 (in shares)	617,518	576,867	576,867
Outstanding at December 31 (in dollars per share)	$ 18.95	$ 18.40	$ 18.40
Converted into shares (in dollars per share)		$ 0
Forfeited (in dollars per share)	$ 0
Outstanding at March 31 (in shares)			617,518
Outstanding at March 31 (in dollars per share)			$ 18.95
Restricted Stock Unites and Performance Stock Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	49,768	35,558
Granted (in dollars per share)	$ 36.63	$ 26.72
Converted into shares (in shares)	(2,610)	0
Converted into shares (in dollars per share)	$ 18.78
Forfeited (in shares)	0
Forfeited (in dollars per share)		$ 0
Outstanding at March 31 (in shares)	664,676	612,425
Outstanding at March 31 (in dollars per share)	$ 20.28	$ 18.89
Vested at March 31 (in shares)	438,914	411,310
Vested at March 31 (in dollars per share)	$ 24.95	$ 20.41

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
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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

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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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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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Number of shares issued under share-based payment arrangement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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The weighted average fair value at grant date for converted equity-based awards issued during the period on other than stock (or unit) option plans.

+ References

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