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Note 7 - Stock Plans - Summary of SSARs (Details) - Stock Settled Stock Appreciation Rights SSARs [Member] - $ / shares	6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Outstanding, awards (in shares)	87,133
Outstanding, weighted average grant date fair value (in dollars per share)	$ 9.69
Outstanding, weighted average remaining contractual term (Year)	4 years 1 month 6 days		4 years 6 months
Granted, awards (in shares)	0
Exercised, awards (in shares)	(7,665)	0
Forfeited, awards (in shares)	0
Outstanding, awards (in shares)	79,468		87,133
Outstanding, weighted average grant date fair value (in dollars per share)	$ 10.18		$ 9.69

X

- 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
-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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-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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X

- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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X

- Definition

Number of non-option equity instruments exercised by participants.

+ References

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- Definition

Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

+ References

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X

- Definition

Net number of non-option equity instruments granted to participants.

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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