Note 6 - Loans And Related Allowance For Loan Losses (Detail) - Classes of the Loan Portfolio Summarized by Credit Quality (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable	$ 410,868	$ 401,880
Pass [Member] | Commercial and Industrial [Member]
Financing Receivable	61,224	53,645
Pass [Member] | Real Estate Construction [Member]
Financing Receivable	19,734	20,883
Pass [Member] | Residential Real Estate Mortgage [Member]
Financing Receivable	192,198	192,534
Pass [Member] | Commercial Real Estate Mortgage [Member]
Financing Receivable	104,925	100,536
Pass [Member] | Consumer Installment [Member]
Financing Receivable	4,318	4,495
Pass [Member]
Financing Receivable	382,399	372,093
Special Mention [Member] | Commercial and Industrial [Member]
Financing Receivable	634	1,104
Special Mention [Member] | Residential Real Estate Mortgage [Member]
Financing Receivable	910	1,100
Special Mention [Member] | Commercial Real Estate Mortgage [Member]
Financing Receivable	2,165	443
Special Mention [Member] | Consumer Installment [Member]
Financing Receivable	3	6
Special Mention [Member]
Financing Receivable	3,712	2,653
Substandard [Member] | Commercial and Industrial [Member]
Financing Receivable	3,793	4,363
Substandard [Member] | Real Estate Construction [Member]
Financing Receivable	675	662
Substandard [Member] | Residential Real Estate Mortgage [Member]
Financing Receivable	13,972	14,505
Substandard [Member] | Commercial Real Estate Mortgage [Member]
Financing Receivable	6,293	7,523
Substandard [Member] | Consumer Installment [Member]
Financing Receivable	24	8
Substandard [Member]
Financing Receivable	24,757	27,061
Doubtful [Member] | Commercial and Industrial [Member]
Financing Receivable		73
Doubtful [Member]
Financing Receivable		73
Commercial and Industrial [Member]
Financing Receivable	65,651	59,185
Real Estate Construction [Member]
Financing Receivable	20,409	21,545
Residential Real Estate Mortgage [Member]
Financing Receivable	207,080	208,139
Commercial Real Estate Mortgage [Member]
Financing Receivable	113,383	108,502
Consumer Installment [Member]
Financing Receivable	$ 4,345	$ 4,509