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Note 14 - Employee Benefits - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Outstanding, January 1 (in shares)	19,750
Outstanding, January 1 (in dollars per share)	$ 20.94
Exercised (in shares)	(12,300)	(8,237)
Exercised (in dollars per share)	$ 23
Outstanding, December 31 (in shares)	7,450	19,750
Outstanding, December 31 (in dollars per share)	$ 17.55	$ 20.94
Exercisable, December 31 (in shares)	7,450
Exercisable, December 31 (in dollars per share)	$ 17.55

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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