Note 6 - Investment Securities (Detail) - Investment Securities With Unrealized Losses Not Recognized In Income (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
More 12 Months Unrealized Losses	$ 1,500
Obligations Of US Government Sponsored Entities [Member]
Less 12 Months Fair Value	9,140	13,494
Less 12 Months Unrealized Losses	10	15
Total Fair Value	9,140	13,494
Total Unrealized Losses	10	15
Obligations Of States And Political Subdivisions [Member]
Less 12 Months Fair Value	7,259	2,913
Less 12 Months Unrealized Losses	66	20
More 12 Months Fair Value	6,503	6,886
More 12 Months Unrealized Losses	19	65
Total Fair Value	13,762	9,799
Total Unrealized Losses	85	85
Mortgage Backed Securities Residential [Member]
Less 12 Months Fair Value	51,131	56,249
Less 12 Months Unrealized Losses	124	196
Total Fair Value	51,131	56,249
Total Unrealized Losses	124	196
Mutual Funds And Equity Securities [Member]
Less 12 Months Fair Value	664
Less 12 Months Unrealized Losses	13
Total Fair Value	664
Total Unrealized Losses	13
Corporate Debt Securities [Member]
Less 12 Months Fair Value	351
Less 12 Months Unrealized Losses	4
More 12 Months Fair Value	4,341	4,299
More 12 Months Unrealized Losses	1,502	1,537
Total Fair Value	4,692	4,299
Total Unrealized Losses	1,506	1,537
Total [Member]
Less 12 Months Fair Value	68,545	72,656
Less 12 Months Unrealized Losses	217	231
More 12 Months Fair Value	10,844	11,185
More 12 Months Unrealized Losses	1,521	1,602
Total Fair Value	79,389	83,841
Total Unrealized Losses	$ 1,738	$ 1,833