Note 8 - Fair Value Measurements (Detail) - Assets Measured At Fair Value On A Nonrecurring Basis (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Commercial	$ 42,980	$ 45,997	$ 43,098
Commercial Loan [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Commercial	7,993	9,248
Commercial Loan [Member] | Fair Value, Inputs, Level 2 [Member]
Commercial	4,553	5,198
Commercial Loan [Member] | Fair Value, Inputs, Level 3 [Member]
Commercial	3,440	4,050
Commercial Loan [Member]
Commercial	7,993	9,248	7,117
Commercial Real Estate Investment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Commercial	5,407	5,600
Commercial Real Estate Investment [Member] | Fair Value, Inputs, Level 2 [Member]
Commercial	3,459	3,924
Commercial Real Estate Investment [Member] | Fair Value, Inputs, Level 3 [Member]
Commercial	1,948	1,676
Commercial Real Estate Investment [Member]
Commercial	5,407	5,600	8,434
Commercial Real Estate Owner Occupied [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Commercial	6,449	6,659
Commercial Real Estate Owner Occupied [Member] | Fair Value, Inputs, Level 2 [Member]
Commercial	6,449	6,452
Commercial Real Estate Owner Occupied [Member] | Fair Value, Inputs, Level 3 [Member]
Commercial		207
Commercial Real Estate Owner Occupied [Member]
Commercial	6,449	6,659	207
Residential Mortgage [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Commercial	691	699
Residential Mortgage [Member] | Fair Value, Inputs, Level 3 [Member]
Commercial	691	699
Residential Mortgage [Member]
Commercial	691	699	731
Home Equity Line of Credit [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Commercial	481	513
Home Equity Line of Credit [Member] | Fair Value, Inputs, Level 2 [Member]
Commercial	481	510
Home Equity Line of Credit [Member] | Fair Value, Inputs, Level 3 [Member]
Commercial		3
Home Equity Line of Credit [Member]
Commercial	481	513	392
Consumer, Other [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Commercial		43
Consumer, Other [Member] | Fair Value, Inputs, Level 3 [Member]
Commercial		43
Consumer, Other [Member]
Commercial		43	4
Estimate of Fair Value, Fair Value Disclosure [Member] | Construction Loans [Member]
Commercial	21,959	23,235
Estimate of Fair Value, Fair Value Disclosure [Member]
Other real estate owned	9,199	5,299
Total assets measured at fair value on a nonrecurring basis	52,179	51,296
Fair Value, Inputs, Level 2 [Member] | Construction Loans [Member]
Commercial	11,995	12,937
Fair Value, Inputs, Level 2 [Member]
Other real estate owned	5,449	4,969
Total assets measured at fair value on a nonrecurring basis	32,386	33,990
Fair Value, Inputs, Level 3 [Member] | Construction Loans [Member]
Commercial	9,964	10,298
Fair Value, Inputs, Level 3 [Member]
Other real estate owned	3,750	330
Total assets measured at fair value on a nonrecurring basis	19,793	17,306
Construction Loans [Member]
Commercial	$ 21,959	$ 23,235	$ 26,213