Note 6 - Basic And Diluted Earnings Per Share (Detail) - Basic And Diluted Earnings Per Share (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Earnings per share
Net income	$ 2,715	$ 1,630	$ 7,536	$ 3,473	$ 5,623
Preferred dividends and accretion of discount	220	420	1,060	1,260
Income available to common shareholders	2,495	1,210	6,476	2,213
Weighted average common shares outstanding (in Shares)	7,948	7,857	7,924	7,832
Add dilutive effect of assumed exercises of options	$ 40	$ 2	$ 20	$ 3
Basic Earnings per Share (in Dollars per share)	$ 0.31	$ 0.15	$ 0.82	$ 0.28
Weighted average common and dilutive potential common shares outstanding (in Shares)	7,988	7,859	7,944	7,835
Diluted Earnings per Share (in Dollars per share)	$ 0.31	$ 0.15	$ 0.82	$ 0.28