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Note 11 - Stock-based Compensation - Summary of Options Outstanding (Details) - Mercantile Plans [Member] - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Minimum exercise price (in dollars per share)	$ 36.22	$ 27.66	$ 22.15
Maximum exercise price (in dollars per share)	$ 36.22	$ 36.22	$ 36.22
Outstanding Number (in shares)	5,000
Average remaining option term (Year)	10 months 24 days	1 year 8 months 12 days	2 years 4 months 24 days
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 36.22
Exercisable Number (in shares)	5,000
Exercisable Weighted Average Exercise Price (in dollars per share)		$ 36.22
Exercise Price Range 2 [Member]
Minimum exercise price (in dollars per share)	$ 36.00
Maximum exercise price (in dollars per share)	$ 37.00
Outstanding Number (in shares)	5,000
Average remaining option term (Year)	10 months 24 days
Outstanding Weighted Average Exercise Price (in dollars per share)	$ 36.22
Exercisable Number (in shares)	5,000
Exercisable Weighted Average Exercise Price (in dollars per share)		$ 36.22

X

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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