Note 13 - Stock Compensation - Summary of Options Outstanding by Exercise Price Range (Details) - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Exercise Price Range 1 [Member]
Outstanding number (in shares)	21,000	28,000
Outstanding weighted average remaining life (Year)	3 years	4 years
Outstanding, weighted average exercise price (in dollars per share)	$ 27.99	$ 27.99
Exercisable number (in shares)	14,000	7,000
Exercisable weighted average exercise price (in dollars per share)	$ 27.99	$ 27.99
Exercisable, weighted average remaining contractual life (Year)	3 years	4 years
Exercise Price Range 2 [Member]
Outstanding number (in shares)	5,600	7,000
Outstanding weighted average remaining life (Year)	4 years	5 years
Outstanding, weighted average exercise price (in dollars per share)	$ 30.58	$ 30.58
Exercisable number (in shares)	1,400
Exercisable weighted average exercise price (in dollars per share)	$ 30.58
Exercisable, weighted average remaining contractual life (Year)	4 years
Exercise Price Range 3 [Member]
Outstanding number (in shares)	2,000	5,000
Outstanding weighted average remaining life (Year)	4 years 292 days	5 years 292 days
Outstanding, weighted average exercise price (in dollars per share)	$ 30.14	$ 30.14
Exercisable number (in shares)	1,000
Exercisable weighted average exercise price (in dollars per share)	$ 30.14
Exercisable, weighted average remaining contractual life (Year)	4 years 292 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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-Publisher FASB
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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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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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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.

+ References

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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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