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Note 14 - Employee Benefits (Details) - Stock Option Activity - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Stock Option Activity [Abstract]
Outstanding, January 1	46,451	58,581
Outstanding, January 1	$ 27.90	$ 28.38
Expired	(10,802)	0
Expired	$ 36.93	$ 0
Exercised	(2,175)	(11,223)
Exercised	$ 21.31	$ 30.45
Forfeited	(1,525)	(907)
Forfeited	$ 33.53	$ 27.35
Outstanding, December 31	31,949	46,451
Outstanding, December 31	$ 25.03	$ 27.90
Exercisable, December 31	31,949	46,451
Exercisable, December 31	$ 25.03	$ 27.90

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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.

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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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.

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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 of the plan that expired.

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

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