Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Impaired loans, average recorded investment	$ 36,119	$ 46,271	$ 40,493
Impaired loans, interest income recognized	423	479	482
Commercial Portfolio Segment [Member]
Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Impaired loans, average recorded investment	6,222	7,239	1,211
Impaired loans, interest income recognized	33	82	7
Commercial Real Estate Construction Financing Receivable [Member]
Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Impaired loans, average recorded investment			82
Commercial Real Estate Other Receivable [Member]
Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Impaired loans, average recorded investment	16,510	24,186	22,486
Impaired loans, interest income recognized	243	291	385
Residential One To Four Family [Member]
Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Impaired loans, average recorded investment	12,229	13,971	16,036
Impaired loans, interest income recognized	114	80	75
Residential Real Estate and Home Equities [Member]
Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Impaired loans, average recorded investment	1,141	875	678
Impaired loans, interest income recognized	33	26	15
Consumer Other Financing Receivable [Member]
Note 5 - Loans (Details) - Average Recorded Investment and Interest Income Recognized on Impaired Loans by Loan Class [Line Items]
Impaired loans, average recorded investment	$ 17