Note 4 - Fair Value Disclosure Measurements (Details) - Assets Measured on a Recurring Basis (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	$ 179,757	$ 194,472
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	0	0
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	26,588	24,960
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	0	0
US Government Agencies Debt Securities [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	26,588	24,960
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	0	0
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	89,718	92,596
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	0	0
US States and Political Subdivisions Debt Securities [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	89,718	92,596
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	58,413	71,102
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] \| Fair Value, Inputs, Level 3 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis		0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	58,413	71,102
Mortgage-backed Securities, Issued by Private Enterprises [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	0	0
Mortgage-backed Securities, Issued by Private Enterprises [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	4,288	5,064
Mortgage-backed Securities, Issued by Private Enterprises [Member] \| Fair Value, Inputs, Level 3 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	0	0
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	4,288	5,064
Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	0	0
Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	179,007	193,722
Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	0	0
Debt Securities [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	179,007	193,722
Equity Securities in Financial Institutions [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	5	5
Equity Securities in Financial Institutions [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	745	745
Equity Securities in Financial Institutions [Member] \| Fair Value, Inputs, Level 3 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	0	0
Equity Securities in Financial Institutions [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	750	750
Fair Value, Inputs, Level 1 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	5	5
Fair Value, Inputs, Level 2 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	179,752	194,467
Fair Value, Inputs, Level 3 [Member]
Assets Measured on a Recurring Basis:
Assets Measured on a Recurring Basis	$ 0	$ 0