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Note 2 - Stock-Based Compensation (Detail) - Stock Option Activity (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Outstanding, January 1	79,693	88,774
Outstanding, January 1 (in Dollars per share)	$ 27.25	$ 26.81
Exercised	18,561	0
Exercised (in Dollars per share)	$ 24.08	$ 0
Outstanding, March 31	61,132	88,774
Outstanding, March 31 (in Dollars per share)	$ 28.21	$ 26.81
Exercisable, March 31	61,132	88,774
Exercisable, March 31 (in Dollars per share)	$ 28.21	$ 26.81

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

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-Subparagraph b(1)(c), d(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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

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+ References

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

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