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Note 10 - Income Taxes (Detail) (USD $)	3 Months Ended
Note 10 - Income Taxes (Detail) (USD $)	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Income Tax Expense (Benefit)	$ 16,547,000	$ 11,734,000
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate	36.40%	34.70%
Income Tax Receivables, Total			39,300,000
Net Operating Loss For Two Thousand Nine To Two Thousand Seven Tax Years Member
Income Tax Receivables, Total			11,200,000
Low Income Housing Tax Credits For Two Thousand Nine To Two Thousand Eight Tax Years Member
Income Tax Receivables, Total			$ 9,100,000

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit that is attributable to changes in the income tax laws or rates.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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