Note 7 - Investments in Affordable Housing (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Note 7 - Investments in Affordable Housing (Details) [Line Items]
Affordable Housing Investments	$ 84,108,000	$ 85,037,000
Number of Limited Partnerships in Housing Investments	6	6
Increase In Total Assets And Liabilities From Consolidating Affordable Housing Equity Interest	23,800,000	22,900,000
Other Borrowings From Consolidating Affordable Housing Equity Interest	19,100,000	18,700,000
Other Liabilities From Affordable Housing Unfunded Commitments	7,000,000	10,600,000
Minimum Compliance Period, Tax Credits, Investments In Affordable Housing	15 years
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount	9,800,000	9,200,000	9,500,000
Federal Tax [Member] | Affordable Housing Limited Partnerships [Member]
Note 7 - Investments in Affordable Housing (Details) [Line Items]
Tax Credit Carryforward, Amount	41,800,000
State and Local Jurisdiction [Member] | Affordable Housing Limited Partnerships [Member]
Note 7 - Investments in Affordable Housing (Details) [Line Items]
Tax Credit Carryforward, Amount	$ 1,600,000