Note 9 - Income Taxes (Detail) - Analysis of Effective and Statutory Federal Income Tax Rates	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Federal statutory rate	35.00%	35.00%	35.00%
Changes from statutory rates resulting from:
Company-owned life insurance	(3.50%)	(15.20%)	8.20%
Uncertain tax position	(0.90%)	14.30%
Other, net	(0.30%)	1.40%	(0.10%)
Effective tax rate on pretax income	19.30%	(30.90%)	22.70%
Tax credits	(1.80%)	(13.00%)	(2.50%)
Interest Income [Member]
Changes from statutory rates resulting from:
Tax Exempt	(7.60%)	(51.50%)	(15.30%)
Interest to Carry Tax-Exempt Obligations [Member]
Changes from statutory rates resulting from:
Nondeductible expense	0.40%	3.60%	1.30%
Legal Expense [Member]
Changes from statutory rates resulting from:
Nondeductible expense	0.50%
Other Income [Member]
Changes from statutory rates resulting from:
Tax Exempt	(2.50%)	(5.50%)	(3.90%)

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to the increase in cash surrender value which is tax exempt income, offset by taxable income resulting from the early surrender of life insurance policies, if any.

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

+ References

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 47

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to nondeductible expenses under enacted tax laws, or differences in the methodologies used to determine expense amounts for financial statements prepared in accordance with generally accepted accounting principles, not otherwise listed in the existing taxonomy.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to all other items not otherwise listed in the existing taxonomy.

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The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in all income tax contingencies, whether recorded or adjusted, during the period.

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The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate that can be explained by all tax credits generated or utilized under enacted tax laws during the period.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to income that is exempt from income taxes under enacted tax laws.

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