Note 4 - Loans and Allowance for Loan Losses (Detail) - Risk Category of Commercial Loans (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Commercial Loans	$ 232,596	$ 252,655
Pass [Member] | Commercial Real Estate Owner Occupied [Member]
Commercial Loans	87,329	103,743
Pass [Member] | Commercial Real Estate Nonowner Occupied [Member]
Commercial Loans	39,088	30,375
Pass [Member] | Construction [Member]
Commercial Loans	19,644	19,519
Pass [Member] | Commercial and Industrial [Member]
Commercial Loans	39,456	36,633
Pass [Member]
Commercial Loans	185,517	190,270
Criticized [Member] | Commercial Real Estate Owner Occupied [Member]
Commercial Loans	12,992	15,030
Criticized [Member] | Commercial Real Estate Nonowner Occupied [Member]
Commercial Loans	8,960	12,815
Criticized [Member] | Commercial and Industrial [Member]
Commercial Loans	427	3,250
Criticized [Member]
Commercial Loans	22,379	31,095
Classified [Member] | Commercial Real Estate Owner Occupied [Member]
Commercial Loans	5,463	10,591
Classified [Member] | Commercial Real Estate Nonowner Occupied [Member]
Commercial Loans	10,372	13,430
Classified [Member] | Construction [Member]
Commercial Loans	1,519	1,952
Classified [Member] | Commercial and Industrial [Member]
Commercial Loans	7,346	5,317
Classified [Member]
Commercial Loans	24,700	31,290
Commercial Real Estate Owner Occupied [Member]
Commercial Loans	105,784	129,364
Commercial Real Estate Nonowner Occupied [Member]
Commercial Loans	58,420	56,620
Construction [Member]
Commercial Loans	21,163	21,471
Commercial and Industrial [Member]
Commercial Loans	$ 47,229	$ 45,200