Note 6 - Loans And Related Allowance For Loan Losses (Detail) - Impaired Loans by Class (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Commercial and Industrial [Member]
With no related allowance recorded:
With no related allowance recorded - recorded investment	$ 742	$ 1,172
With no related allowance recorded - unpaid principal balance	742	1,172
With an allowance recorded:
With an allowance recorded - recorded Investment	453	465
With an allowance recorded - unpaid principal balance	453	465
With an allowance recorded - related allowance	248	196
Total:
Recorded investment	1,195	1,637
Unpaid principal balance	1,195	1,637
Related Allowance	248	196
Real Estate Construction [Member]
With no related allowance recorded:
With no related allowance recorded - recorded investment	203	4,250
With no related allowance recorded - unpaid principal balance	203	4,250
With an allowance recorded:
With an allowance recorded - recorded Investment	217	271
With an allowance recorded - unpaid principal balance	217	271
With an allowance recorded - related allowance	125	125
Total:
Recorded investment	420	4,521
Unpaid principal balance	420	4,521
Related Allowance	125	125
Residential Real Estate Mortgage [Member]
With no related allowance recorded:
With no related allowance recorded - recorded investment	2,667	3,188
With no related allowance recorded - unpaid principal balance	2,668	3,193
With an allowance recorded:
With an allowance recorded - recorded Investment	267	0
With an allowance recorded - unpaid principal balance	269	0
With an allowance recorded - related allowance	266	0
Total:
Recorded investment	2,934	3,188
Unpaid principal balance	2,937	3,193
Related Allowance	266	0
Commercial Real Estate Mortgage [Member]
With no related allowance recorded:
With no related allowance recorded - recorded investment	1,653	2,528
With no related allowance recorded - unpaid principal balance	1,661	2,536
With an allowance recorded:
With an allowance recorded - recorded Investment	711	2,555
With an allowance recorded - unpaid principal balance	712	2,560
With an allowance recorded - related allowance	239	551
Total:
Recorded investment	2,364	5,083
Unpaid principal balance	2,373	5,096
Related Allowance	239	551
Consumer Installment [Member]
With no related allowance recorded:
With no related allowance recorded - recorded investment	26	24
With no related allowance recorded - unpaid principal balance	26	24
With an allowance recorded:
With an allowance recorded - recorded Investment	0
With an allowance recorded - unpaid principal balance	0
With an allowance recorded - related allowance	0	0
Total:
Recorded investment	26	24
Unpaid principal balance	26	24
Related Allowance	$ 0	$ 0