Note 9 - Fair Value Measurements and Disclosures (Details) - Financial Assets Measured at Fair Value on a Recurring and Nonrecurring Basis (USD $)	Mar. 31, 2014	Dec. 31, 2013
Trading Securities
State and municipal securities	$ 4,485,000	$ 0
Securities available-for-sale
Available for Sale Securities	359,452,000	388,670,000
Total Recurring Fair Value Measurements	363,937,000	388,670,000
Nonrecurring fair value measurements
Nonrecurring Fair Value Measurements	3,037,000	3,626,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Trading Securities
State and municipal securities	4,485,000
Securities available-for-sale
Available for Sale Securities	80,235,000	87,199,000
US States and Political Subdivisions Debt Securities [Member]
Trading Securities
State and municipal securities	4,485,000
Securities available-for-sale
Available for Sale Securities	80,235,000	87,199,000
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale
Available for Sale Securities	62,094,000	71,639,000
US Government Agencies Debt Securities [Member]
Securities available-for-sale
Available for Sale Securities	62,094,000	71,639,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale
Available for Sale Securities	129,762,000	139,723,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities available-for-sale
Available for Sale Securities	129,762,000	139,723,000
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale
Available for Sale Securities	72,330,000	75,394,000
Collateralized Mortgage Obligations [Member]
Securities available-for-sale
Available for Sale Securities	72,330,000	75,394,000
Pooled Trust Preferred Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale
Available for Sale Securities	2,238,000	2,069,000
Pooled Trust Preferred Securities [Member]
Securities available-for-sale
Available for Sale Securities	2,238,000	2,069,000
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale
Available for Sale Securities	6,050,000	6,021,000
Corporate Debt Securities [Member]
Securities available-for-sale
Available for Sale Securities	6,050,000	6,021,000
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale
Available for Sale Securities	6,743,000	6,625,000
Equity Securities [Member]
Securities available-for-sale
Available for Sale Securities	6,743,000	6,625,000
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Nonrecurring fair value measurements
Nonrecurring Fair Value Measurements	2,528,000	3,107,000
Impaired Loans [Member]
Nonrecurring fair value measurements
Nonrecurring Fair Value Measurements	2,528,000	3,107,000
Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 3 [Member]
Nonrecurring fair value measurements
Nonrecurring Fair Value Measurements	509,000	519,000
Mortgage Servicing Rights [Member]
Nonrecurring fair value measurements
Nonrecurring Fair Value Measurements	509,000	519,000
Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale
Available for Sale Securities	6,743,000	6,625,000
Total Recurring Fair Value Measurements	6,743,000	6,625,000
Fair Value, Inputs, Level 2 [Member]
Trading Securities
State and municipal securities	4,485,000
Securities available-for-sale
Available for Sale Securities	350,471,000	379,976,000
Total Recurring Fair Value Measurements	354,956,000	379,976,000
Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale
Available for Sale Securities	2,238,000	2,069,000
Total Recurring Fair Value Measurements	2,238,000	2,069,000
Nonrecurring fair value measurements
Nonrecurring Fair Value Measurements	$ 3,037,000	$ 3,626,000