Note 5 - Loans (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 5 - Loans (Details) [Line Items]
Loans and Leases Receivable, Deferred Income	$ 596,000	$ 643,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	1,300,000
Mortgage Loans Serviced for Benefit of Others	375,100,000	384,500,000
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	478,000	757,000
Financing Receivable Reclassified From Troubled Debt Restructuring	8,615,000	7,077,000	6,018,000
Financing Receivable Reclassification from Impaired Status Recorded Investment	7,100,000
Impaired Financing Receivable, Interest Income, Accrual Method	1,500,000	1,600,000
Impaired Financing Receivable, Average Recorded Investment	41,600,000	44,700,000
Federal Home Loan Bank Advances [Member]
Note 5 - Loans (Details) [Line Items]
Loans Pledged as Collateral	170,600,000	205,200,000
Lendable Collateral	79,100,000	90,200,000
Federal Reserve Services [Member]
Note 5 - Loans (Details) [Line Items]
Loans Pledged as Collateral	38,200,000	794,000
Lendable Collateral	$ 27,800,000	$ 651,000