Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]
Available-for-sale Securities Fair Value	$ 205,020	$ 181,712
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 Fair Value	174,444	147,854
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 Fair Value	174,444	147,854
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 Fair Value	20,545	23,456
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 Fair Value	20,545	23,456
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 Fair Value	2,206	2,840
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 Fair Value	2,206	2,840
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 Fair Value	7,692	7,395
Corporate Securities [Member]
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]
Available-for-sale Securities Fair Value	7,692	7,395
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 Fair Value	133	167
Other Securities [Member]
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]
Available-for-sale Securities Fair Value	133	167
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 Fair Value	$ 205,020	$ 181,712