Note 8 - Fair Value Measurements (Details) - Assets and Liabilities at Fair Value on Recurring Basis (USD $) In Thousands, unless otherwise specified	Mar. 31, 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	$ 238,496	$ 222,844
US Government Agencies Debt 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]
Securities available-for-sale	210,757	194,219
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	210,757	194,219
US States and Political Subdivisions Debt 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]
Securities available-for-sale	18,401	19,380
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	18,401	19,380
Collateralized 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]
Securities available-for-sale	1,844	2,014
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	1,844	2,014
Corporate Debt 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]
Securities available-for-sale	7,373	7,104
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	7,373	7,104
Other Debt Obligations [Member] | 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	121	127
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	121	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	$ 238,496	$ 222,844