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Note 2 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

Share-based Compensation, Stock Options, Activity [Table Text Block]

						Weighted-								Weighted-
						average								average
						Exercise								Exercise
		2017				Price				2016				Price
Outstanding, January 1			29,324			$	19.50				31,949			$	25.03
Exercised			(1,562	)			34.34				-				-
Outstanding, March 31			27,762			$	23.07				31,949			$	25.03
Exercisable, March 31			27,762			$	23.07				31,949			$	25.03

X

- Definition

Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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