Note 3 - Loans (Detail) - Age Analysis of Past Due Loans Excluding Nonaccrual Loans (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
30-59 Days Past Due	$ 5,916	$ 2,490
60-89 Days Past Due	474	3,125
90 Days or More Past Due	64	37
Total Past Due	6,454	5,652
Nonaccrual loans	12,872	15,668
Current	941,992	942,442
Total Financing Receivables	961,318	963,762
Recorded Investment > 90 days and accruing	64	37
Commercial and Industrial [Member]
30-59 Days Past Due	296	206
60-89 Days Past Due	11	140
90 Days or More Past Due	0	0
Total Past Due	307	346
Nonaccrual loans	281	447
Current	150,469	149,251
Total Financing Receivables	151,057	150,044
Recorded Investment > 90 days and accruing	0	0
Commercial Real Estate Loans [Member]
30-59 Days Past Due	3,011	604
60-89 Days Past Due	199	1,881
90 Days or More Past Due	0	0
Total Past Due	3,210	2,485
Nonaccrual loans	6,652	8,454
Current	461,633	461,758
Total Financing Receivables	471,495	472,697
Recorded Investment > 90 days and accruing	0	0
First Lien Residential Mortgage Loans [Member]
30-59 Days Past Due	1,774	772
60-89 Days Past Due	124	969
90 Days or More Past Due	28	37
Total Past Due	1,926	1,778
Nonaccrual loans	5,466	6,038
Current	208,534	206,580
Total Financing Receivables	215,926	214,396
Recorded Investment > 90 days and accruing	28	37
Junior Lein Residential Mortgage Loans [Member]
30-59 Days Past Due	395	473
60-89 Days Past Due	34	96
90 Days or More Past Due	36	0
Total Past Due	465	569
Nonaccrual loans	416	328
Current	55,454	57,850
Total Financing Receivables	56,335	58,747
Recorded Investment > 90 days and accruing	36	0
Consumer Loans [Member]
30-59 Days Past Due	440	435
60-89 Days Past Due	106	39
90 Days or More Past Due	0	0
Total Past Due	546	474
Nonaccrual loans	57	401
Current	65,674	66,798
Total Financing Receivables	66,277	67,673
Recorded Investment > 90 days and accruing	0	0
Deferred Fees and Costs [Member]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
90 Days or More Past Due	0	0
Total Past Due	0	0
Nonaccrual loans		0
Total Financing Receivables	228	205
Recorded Investment > 90 days and accruing	$ 0	$ 0