Note 7 - Fair Value Measurement (Details) - Fair Value of Financial Assets and Liabililties Measure on Recurring Basis (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Assets:
Available-for-sale securities	$ 56,662	$ 57,922
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Available-for-sale securities	27,192	26,284
US Government Agencies Debt Securities [Member]
Assets:
Available-for-sale securities	27,192	26,284
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Available-for-sale securities	11,282	15,361
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Assets:
Available-for-sale securities	11,282	15,361
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Available-for-sale securities	18,188	16,277
US States and Political Subdivisions Debt Securities [Member]
Assets:
Available-for-sale securities	18,188	16,277
Fair Value, Inputs, Level 2 [Member]
Assets:
Available-for-sale securities	$ 56,662	$ 57,922