Note 4 - Loans and Allowance for Loan Losses (Details) - Allowance for Loan Losses and the Recorded Investment of Loans (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Allowance for loan losses:
Individually evaluated for impairment	$ 3,054		$ 2,107	$ 2,206
Collectively evaluated for impairment	4,212		4,798
Total ending allowance balance	7,266	6,468	6,905	8,185	7,527	7,344
Loans:
Loans individually evaluated for impairment	15,700		17,401
Loans collectively evaluated for impairment	540,513		540,887
Total ending loans balance	556,213		558,288
Residential Portfolio Segment [Member]
Allowance for loan losses:
Individually evaluated for impairment	237		128
Collectively evaluated for impairment	1,114		1,201
Total ending allowance balance	1,351	1,192	1,329	1,662	1,443	1,730
Loans:
Loans individually evaluated for impairment	1,410		827
Loans collectively evaluated for impairment	214,591		225,195
Total ending loans balance	216,001		226,022
Commercial Real Estate Portfolio Segment [Member]
Allowance for loan losses:
Individually evaluated for impairment	1,699		1,979
Collectively evaluated for impairment	1,696		1,967
Total ending allowance balance	3,395	3,034	3,946	4,736	4,369	3,623
Loans:
Loans individually evaluated for impairment	11,073		16,354
Loans collectively evaluated for impairment	166,520		158,656
Total ending loans balance	177,593		175,010
Commercial and Industrial [Member]
Allowance for loan losses:
Individually evaluated for impairment	1,111		0
Collectively evaluated for impairment	536		783
Total ending allowance balance	1,647	1,342	783	742	653	636
Loans:
Loans individually evaluated for impairment	2,999		0
Loans collectively evaluated for impairment	58,523		57,239
Total ending loans balance	61,522		57,239
Consumer Portfolio Segment [Member]
Allowance for loan losses:
Individually evaluated for impairment	7		0
Collectively evaluated for impairment	866		847
Total ending allowance balance	873	900	847	1,045	1,062	1,355
Loans:
Loans individually evaluated for impairment	218		220
Loans collectively evaluated for impairment	100,879		99,797
Total ending loans balance	$ 101,097		$ 100,017