Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]
Securities available-for-sale	$ 218,524	$ 222,844
US Government Agencies Debt Securities [Member]
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]
Securities available-for-sale	192,946	194,219
US States and Political Subdivisions Debt Securities [Member]
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]
Securities available-for-sale	17,130	19,380
Collateralized Mortgage Backed Securities [Member]
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]
Securities available-for-sale	1,690	2,014
Corporate Debt Securities [Member]
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]
Securities available-for-sale	6,623	7,104
Other Debt Obligations [Member]
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]
Securities available-for-sale	135	127
Fair Value, Inputs, Level 2 [Member]
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]
Securities available-for-sale	218,524	222,844
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]
Securities available-for-sale	192,946	194,219
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]
Securities available-for-sale	17,130	19,380
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member]
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]
Securities available-for-sale	1,690	2,014
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]
Securities available-for-sale	6,623	7,104
Fair Value, Inputs, Level 2 [Member] | Other Debt Obligations [Member]
Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis [Line Items]
Securities available-for-sale	$ 135	$ 127