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Note 13 - Employee Benefits (Detail) - Stock Option Activity (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Outstanding, January 1	88,774	89,077
Outstanding, January 1 (in Dollars per share)	$ 26.81	$ 27.87
Granted		9,000
Granted (in Dollars per share)		$ 17.55
Forfeited	(9,081)	(9,303)
Forfeited (in Dollars per share)	$ 22.94	$ 28.03
Outstanding, December 31	79,693	88,774
Outstanding, December 31 (in Dollars per share)	$ 27.25	$ 26.81
Exercisable, December 31	79,693	79,774
Exercisable, December 31 (in Dollars per share)	$ 27.25	$ 27.85

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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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-Subparagraph (c)(1)(iii)

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-Paragraph A240

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X

- 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

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

-Publisher FASB

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-Topic 718

-SubTopic 10

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-Paragraph 2

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-Paragraph A240

-Subparagraph b(1)(f)

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ References

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-Number 123R

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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 grantees could have acquired the underlying shares with respect to stock options that were terminated.

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