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Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis (USD $)
Jun. 30, 2014
Dec. 31, 2013
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis $ 165,506,000 $ 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 25,061,000 25,763,000
US Government Agencies Debt Securities [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 25,061,000 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 98,772,000 88,614,000
US States and Political Subdivisions Debt Securities [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 98,772,000 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 37,599,000 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 37,599,000 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 3,318,000 3,693,000
Mortgage-backed Securities, Issued by Private Enterprises [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 3,318,000 3,693,000
Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 164,750,000 156,393,000
Debt Securities [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 164,750,000 156,393,000
Equity Securities in Financial Institutions [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 5,000 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 751,000 745,000
Equity Securities in Financial Institutions [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 756,000 750,000
Fair Value, Inputs, Level 1 [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 5,000 5,000
Fair Value, Inputs, Level 2 [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 165,501,000 157,138,000
Fair Value, Inputs, Level 3 [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis $ 0 $ 0