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Note 13 - Employee Benefits (Detail) - Stocks Options Outstanding by Grant Date (USD $) |  |  |  | 0 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 08, 2003 Granted December 8, 2003 [Member] | May 12, 2004 Granted May 12, 2004 [Member] | Dec. 13, 2004 Granted December 13, 2004 [Member] | Dec. 14, 2005 Granted December 14, 2005 [Member] | Dec. 10, 2006 Granted December 10, 2006 [Member] | Apr. 19, 2007 Granted April 19, 2007 [Member] | May 16, 2007 Granted May 16, 2007 [Member] | Dec. 10, 2007 Granted December 10, 2007 [Member] | Jan. 02, 2008 Granted January 2, 2008 [Member] | Nov. 10, 2008 Granted November 10, 2008 [Member] | May 09, 2011 Granted May 19, 2011 [Member]
Exercise Price | $ 27.25 | $ 26.81 | $ 27.87 | $ 24.29 | $ 27.35 | $ 30.45 | $ 36.73 | $ 40.24 | $ 37.33 | $ 37.48 | $ 37.00 | $ 36.25 | $ 23.00 | $ 17.55
Shares Outstanding (in Shares) | 79,693 | 88,774 | 89,077 | 18,112 | 907 | 11,223 | 7,163 | 3,150 | 3,639 | 1,337 | 2,450 | 1,337 | 21,500 | 8,875
Contractual Average Life |  |  |  | 343 days | 1 year 120 days | 1 year 346 days | 2 years 346 days | 3 years 346 days | 4 years 113 days | 4 years 149 days | 4 years 346 days | 5 years 43 days | 5 years 346 days | 8 years 149 days
Average Exercise Price | $ 27.25 | $ 26.81 | $ 27.87 | $ 24.29 | $ 27.35 | $ 30.45 | $ 36.73 | $ 40.24 | $ 37.33 | $ 37.48 | $ 37.00 | $ 36.25 | $ 23.00 | $ 17.55
Shares Exercisable (in Shares) | 79,693 | 79,774 |  | 18,112 | 907 | 11,223 | 7,163 | 3,150 | 3,639 | 1,337 | 2,450 | 1,337 | 21,500 | 8,875
Average Exercise Price | $ 27.25 | $ 27.85 |  | $ 24.29 | $ 27.35 | $ 30.45 | $ 36.73 | $ 40.24 | $ 37.73 | $ 37.48 | $ 37.00 | $ 36.25 | $ 23.00 | $ 17.55

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- 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -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. + Details
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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 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(c) -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. + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(b) -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -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. + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -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. + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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