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Note 3 - Stock-based Compensation - Stock Option Activity (Details)	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Outstanding (in shares) | shares	19,750
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 20.94
Exercised (in shares) | shares	(1,500)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 23
Outstanding (in shares) | shares	18,250
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 20.78
Exercisable (in shares) | shares	18,250
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 20.78

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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
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- Definition

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.

+ References

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Number of options outstanding, including both vested and non-vested options.

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

+ References

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