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Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities $ 205,948 $ 189,815
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 2,032 2,073
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
US Treasury Securities [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 2,032 2,073
US Government Agencies [Member] | Fair Value, Inputs, Level 1 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
US Government Agencies [Member] | Fair Value, Inputs, Level 2 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 161,786 129,564
US Government Agencies [Member] | Fair Value, Inputs, Level 3 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
US Government Agencies [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 161,786 129,564
States and Political Subdivisions [Member] | Fair Value, Inputs, Level 1 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
States and Political Subdivisions [Member] | Fair Value, Inputs, Level 2 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 27,887 36,779
States and Political Subdivisions [Member] | Fair Value, Inputs, Level 3 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
States and Political Subdivisions [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 27,887 36,779
Mortgage-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Mortgage-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 3,581 4,569
Mortgage-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Mortgage-backed Securities [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 3,581 4,569
Corporate Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Corporate Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 8,438 14,575
Corporate Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Corporate Securities [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 8,438 14,575
Other Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Other Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 2,224 2,255
Other Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Other Securities [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 2,224 2,255
Fair Value, Inputs, Level 1 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 0 0
Fair Value, Inputs, Level 2 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities 205,948 189,815
Fair Value, Inputs, Level 3 [Member]
    
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]    
Available-for-sale Securities $ 0 $ 0