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Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis (USD $)
Sep. 30, 2014
Dec. 31, 2013
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis $ 156,021,000 $ 157,143,000
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 22,883,000 25,763,000
US Government Agencies Debt Securities [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 22,883,000 25,763,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 99,249,000 88,614,000
US States and Political Subdivisions Debt Securities [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 99,249,000 88,614,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 29,984,000 38,323,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 29,984,000 38,323,000
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 3,122,000 3,693,000
Mortgage-backed Securities, Issued by Private Enterprises [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 3,122,000 3,693,000
Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 155,238,000 156,393,000
Debt Securities [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 155,238,000 156,393,000
Equity Securities in Financial Institutions [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 33,000 5,000
Equity Securities in Financial Institutions [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 750,000 745,000
Equity Securities in Financial Institutions [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 783,000 750,000
Fair Value, Inputs, Level 1 [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 33,000 5,000
Fair Value, Inputs, Level 2 [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 155,988,000 157,138,000
Fair Value, Inputs, Level 3 [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis $ 0 $ 0