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Note 4 - Loans and Allowance for Loan Losses (Details) - Concentrations Within the Loan Portfolio (USD $)
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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|---|---|---|---|
| Note 4 - Loans and Allowance for Loan Losses (Details) - Concentrations Within the Loan Portfolio [Line Items] | |||
| Commercial real estate loans to lessors of non-residential buildings | $ 2,089,277,000 | $ 1,053,243,000 | $ 1,041,189,000 |
| Commercial Real Estate Loans to Lessors of Non-Residential Buildings [Member] | |||
| Note 4 - Loans and Allowance for Loan Losses (Details) - Concentrations Within the Loan Portfolio [Line Items] | |||
| Commercial real estate loans to lessors of non-residential buildings | $ 480,170,000 | $ 299,446,000 | |
| Commercial real estate loans to lessors of non-residential buildings | 23.00% | 28.40% |