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Note 12 - Stock-based Compensation - Employee Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Outstanding (in shares)	66,098	86,348	164,098
Outstanding (in dollars per share)	$ 10.92	$ 11.09	$ 10.99
Exercised (in shares)	(7,917)	(20,250)	(77,708)
Exercised (in dollars per share)	$ 11.41	$ 11.65	$ 10.88
Canceled (in shares)	(2,050)		(42)
Canceled (in dollars per share)	$ 10.91		$ 11.22
Outstanding (in shares)	56,131	66,098	86,348
Outstanding (in dollars per share)	$ 10.85	$ 10.92	$ 11.09
Exercised (in shares)	(7,917)	(20,250)	(77,708)
Exercised (in dollars per share)	$ 11.41	$ 11.65	$ 10.88
Canceled (in shares)	2,050		42
Options exercisable (in shares)	43,331
Options exercisable (in dollars per share)	$ 10.84

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

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

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Weighted average price at which grantees can acquire the shares reserved for issuance 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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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Number of share options (or share units) exercised during the current period.

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