Note 3 - Loans (Detail) - Age Analysis of Past Due Loans Excluding Nonaccrual Loans (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
30-59 Days Past Due	$ 2,543	$ 7,734
60-89 Days Past Due	2,027	2,945
90 Days or More Past Due	558	419
Total Past Due	5,128	11,098
Current	965,024	950,120
Total Financing Receivables	988,030	983,909	1,005,962
Recorded Investment > 90 days and accruing	567	427
Commercial and Industrial [Member]
30-59 Days Past Due	622	1,039
60-89 Days Past Due	223	94
90 Days or More Past Due	8	0
Total Past Due	853	1,133
Current	160,092	155,589
Total Financing Receivables	162,397	158,493
Recorded Investment > 90 days and accruing	8	0
Commercial Real Estate Loans [Member]
30-59 Days Past Due	562	4,313
60-89 Days Past Due	437	500
90 Days or More Past Due	177	0
Total Past Due	1,176	4,813
Current	469,164	462,571
Total Financing Receivables	481,525	482,720
Recorded Investment > 90 days and accruing	177	0
First Lien Residential Mortgage Loans [Member]
30-59 Days Past Due	698	973
60-89 Days Past Due	1,154	1,875
90 Days or More Past Due	356	328
Total Past Due	2,208	3,176
Current	206,850	202,847
Total Financing Receivables	213,732	211,119
Recorded Investment > 90 days and accruing	365	336
Junior Lein Residential Mortgage Loans [Member]
30-59 Days Past Due	192	561
60-89 Days Past Due	100	255
90 Days or More Past Due	17	73
Total Past Due	309	889
Current	61,811	65,886
Total Financing Receivables	62,347	67,053
Recorded Investment > 90 days and accruing	17	73
Consumer Loans [Member]
30-59 Days Past Due	469	848
60-89 Days Past Due	113	221
90 Days or More Past Due	0	18
Total Past Due	582	1,087
Current	67,107	63,227
Total Financing Receivables	68,029	64,524
Recorded Investment > 90 days and accruing	$ 0	$ 18