Note 3 - Investment Securities Available for Sale (Detail) - Gross Unrealized Losses And Fair Value (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Less than 12 Months Estimated Fair Value	$ 51,955	$ 51,955
Less than 12 Months Unrealized Losses	856	315
12 Months or Greater Estimated Fair Value	2,863	2,855
12 Months or Greater Unrealized Losses	60	98
Total Estimated Fair Value	54,818	54,810
Total Unrealized Losses	916	413
Municipal Bonds [Member]
Less than 12 Months Estimated Fair Value	3,964	3,964
Less than 12 Months Unrealized Losses	312	51
12 Months or Greater Unrealized Losses	2
Total Estimated Fair Value	3,964	3,964
Total Unrealized Losses	314	51
US Government Agencies Debt Securities [Member]
Less than 12 Months Estimated Fair Value	2,999	2,999
Less than 12 Months Unrealized Losses	7	1
Total Estimated Fair Value	2,999	2,999
Total Unrealized Losses	7	1
Residential Mortgage Backed Securities [Member]
Less than 12 Months Estimated Fair Value	44,992	44,992
Less than 12 Months Unrealized Losses	537	263
12 Months or Greater Estimated Fair Value	2,743	2,743
12 Months or Greater Unrealized Losses		33
Total Estimated Fair Value	47,735	47,735
Total Unrealized Losses	537	296
Equity Investment Other [Member]
12 Months or Greater Estimated Fair Value	120	112
12 Months or Greater Unrealized Losses	58	65
Total Estimated Fair Value	120	112
Total Unrealized Losses	$ 58	$ 65