Note 7 - Fair Value Measurements (Detail) - Assets Measured At Fair Value On A Nonrecurring Basis (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Commercial	$ 41,206	$ 46,667	$ 44,045
Commercial Loan [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Commercial	7,282	10,695
Commercial Loan [Member] | Fair Value, Inputs, Level 2 [Member]
Commercial	4,149	6,011
Commercial Loan [Member] | Fair Value, Inputs, Level 3 [Member]
Commercial	3,133	4,684
Commercial Loan [Member]
Commercial	7,282	10,695	10,742
Commercial Real Estate Investment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Commercial	5,789	11,205
Commercial Real Estate Investment [Member] | Fair Value, Inputs, Level 2 [Member]
Commercial	5,489	3,927
Commercial Real Estate Investment [Member] | Fair Value, Inputs, Level 3 [Member]
Commercial	300	7,278
Commercial Real Estate Investment [Member]
Commercial	5,789	11,205	6,750
Commercial Real Estate Owner Occupied [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Commercial	2,374	282
Commercial Real Estate Owner Occupied [Member] | Fair Value, Inputs, Level 2 [Member]
Commercial	2,374
Commercial Real Estate Owner Occupied [Member] | Fair Value, Inputs, Level 3 [Member]
Commercial		282
Commercial Real Estate Owner Occupied [Member]
Commercial	2,374	282	1,080
Residential Mortgage [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Commercial	713	1,041
Residential Mortgage [Member] | Fair Value, Inputs, Level 3 [Member]
Commercial	713	1,041
Residential Mortgage [Member]
Commercial	713	1,041	1,049
Home Equity Line of Credit [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Commercial	670	624
Home Equity Line of Credit [Member] | Fair Value, Inputs, Level 2 [Member]
Commercial	590	214
Home Equity Line of Credit [Member] | Fair Value, Inputs, Level 3 [Member]
Commercial	80	410
Home Equity Line of Credit [Member]
Commercial	670	624	664
Consumer, Other [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Commercial	7	8
Consumer, Other [Member] | Fair Value, Inputs, Level 3 [Member]
Commercial	7	8
Consumer, Other [Member]
Commercial	7	8	8
Estimate of Fair Value, Fair Value Disclosure [Member] | Construction Loans [Member]
Commercial	24,371	22,812
Estimate of Fair Value, Fair Value Disclosure [Member]
Other real estate owned	4,923	3,225
Total assets measured at fair value on a nonrecurring basis	46,129	49,892
Fair Value, Inputs, Level 2 [Member] | Construction Loans [Member]
Commercial	15,150	18,086
Fair Value, Inputs, Level 2 [Member]
Other real estate owned	4,673	1,135
Total assets measured at fair value on a nonrecurring basis	32,425	29,373
Fair Value, Inputs, Level 3 [Member] | Construction Loans [Member]
Commercial	9,221	4,726
Fair Value, Inputs, Level 3 [Member]
Other real estate owned	250	2,090
Total assets measured at fair value on a nonrecurring basis	13,704	20,519
Construction Loans [Member]
Commercial	$ 24,371	$ 22,812	$ 23,752