Note 19 - Stock-based Compensation - Performance-based Restricted Stock Units (Details) - $ / shares	3 Months Ended	12 Months Ended
Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Expected shares to be awarded (in shares)	63,000
Performance Shares [Member]
Vesting period (Year)	3 years
Performance Shares [Member] \| Executive Officer [Member]
Vesting period (Year)	3 years	3 years	3 years
Fair value at grant date (in dollars per share)	$ 41.84	$ 54.33	$ 48.48
Expected shares to be awarded (in shares)	34,452	13,402	14,538

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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-Topic 718
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- Definition

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).

+ References

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