Note 5 - 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
	Mar. 31, 2013	Mar. 31, 2012
Earnings per share
Net income	$ 2,863	$ 2,417
Preferred dividends and accretion of discount	209	420
Income available to common shareholders	2,654	1,997
Weighted average common shares outstanding (in Shares)	8,016	7,897
Add dilutive effect of assumed exercises of options	$ 48	$ 6
Basic Earnings per Share (in Dollars per share)	$ 0.33	$ 0.25
Weighted average common and dilutive potential common shares outstanding (in Shares)	8,064	7,903
Diluted Earnings per Share (in Dollars per share)	$ 0.33	$ 0.25