Note 6 - Loans And Related Allowance For Loan Losses (Detail) - Past Due Financing Receivables (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable Current	$ 390,734	$ 380,379
Financing Receivable 30-59 Days Past Due	3,612	3,045
Financing Receivable 60-89 Days Past Due	1,083	1,332
Financing Receivable 90 Days + Past Due	129	319
Financing Receivable Total Past Due	4,824	4,696
Financing Receivable Non-Accrual	15,310	16,805
Financing Receivable	410,868	401,880
Commercial and Industrial [Member]
Financing Receivable Current	62,581	57,291
Financing Receivable 30-59 Days Past Due	1,173	258
Financing Receivable 60-89 Days Past Due	284	16
Financing Receivable 90 Days + Past Due	20	44
Financing Receivable Total Past Due	1,477	318
Financing Receivable Non-Accrual	1,593	1,576
Financing Receivable	65,651	59,185
Real Estate Construction [Member]
Financing Receivable Current	19,963	20,862
Financing Receivable 30-59 Days Past Due		20
Financing Receivable Total Past Due		20
Financing Receivable Non-Accrual	446	663
Financing Receivable	20,409	21,545
Residential Real Estate Mortgage [Member]
Financing Receivable Current	193,798	193,732
Financing Receivable 30-59 Days Past Due	2,147	2,624
Financing Receivable 60-89 Days Past Due	621	863
Financing Receivable 90 Days + Past Due	109	275
Financing Receivable Total Past Due	2,877	3,762
Financing Receivable Non-Accrual	10,405	10,645
Financing Receivable	207,080	208,139
Commercial Real Estate Mortgage [Member]
Financing Receivable Current	110,103	104,086
Financing Receivable 30-59 Days Past Due	251	83
Financing Receivable 60-89 Days Past Due	178	412
Financing Receivable Total Past Due	429	495
Financing Receivable Non-Accrual	2,851	3,921
Financing Receivable	113,383	108,502
Consumer Installment [Member]
Financing Receivable Current	4,289	4,408
Financing Receivable 30-59 Days Past Due	41	60
Financing Receivable 60-89 Days Past Due		41
Financing Receivable Total Past Due	41	101
Financing Receivable Non-Accrual	15
Financing Receivable	$ 4,345	$ 4,509