Note 7 - Fair Value Measurements (Details) - Fair Value of Financial Assets and Liabililties Measure on Recurring Basis (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets:
Available-for-sale securities	$ 51,158	$ 54,603
Bank owned life insurance	6,150	3,622
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Available-for-sale securities	24,967	26,965
US Government Agencies Debt Securities [Member]
Assets:
Available-for-sale securities	24,967	26,965
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Available-for-sale securities	8,811	9,739
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Assets:
Available-for-sale securities	8,811	9,739
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Available-for-sale securities	17,380	17,899
US States and Political Subdivisions Debt Securities [Member]
Assets:
Available-for-sale securities	17,380	17,899
Fair Value, Inputs, Level 2 [Member]
Assets:
Available-for-sale securities	51,158	54,603
Bank owned life insurance	$ 6,150	$ 3,622