Note 15 - Stock Compensation - Summary of Options Outstanding by Exercise Price Range (Details) - $ / shares	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Exercise Price Range 1 [Member]
Outstanding number (in shares)	7,000	14,000
Outstanding weighted average remaining life (Year)	1 year	2 years
Outstanding, weighted average exercise price (in dollars per share)	$ 27.99	$ 27.99
Exercisable number (in shares)	28,000	21,000
Exercisable weighted average exercise price (in dollars per share)	$ 27.99	$ 27.99
Exercisable, weighted average remaining contractual life (Year)	1 year	2 years
Exercise Price Range 2 [Member]
Outstanding number (in shares)	2,800	4,200
Outstanding weighted average remaining life (Year)	2 years	3 years
Outstanding, weighted average exercise price (in dollars per share)	$ 30.58	$ 30.58
Exercisable number (in shares)	4,200	2,800
Exercisable weighted average exercise price (in dollars per share)	$ 30.58	$ 30.58
Exercisable, weighted average remaining contractual life (Year)	2 years	3 years
Exercise Price Range 3 [Member]
Outstanding number (in shares)	1,000	1,500
Outstanding weighted average remaining life (Year)	2 years 9 months 18 days	3 years 9 months 18 days
Outstanding, weighted average exercise price (in dollars per share)	$ 30.14	$ 30.14
Exercisable number (in shares)	2,000	1,500
Exercisable weighted average exercise price (in dollars per share)	$ 30.14	$ 30.14
Exercisable, weighted average remaining contractual life (Year)	2 years 9 months 18 days	3 years 9 months 18 days

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.

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

+ References

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-Publisher FASB
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- Definition

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

+ References

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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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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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