Note 5 - Stockholders' Equity and Earnings Per Common Share (Detail) - Earnings per common share calculations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income (in Dollars)	$ 4,006	$ 3,780
Net income available to common shareholders (in Dollars)	4,006	3,634
Weighted average number of common shares used in earnings per common share – basic	3,266,712	3,190,518
Year 2013 (Member)
Net income (in Dollars)	4,006
Net income available to common shareholders (in Dollars)	4,006
Weighted average number of common shares used in earnings per common share – basic	3,266,712
Stock option awards and Warrant	104,565
Weighted average number of common shares used in earnings per common share – assuming dilution	3,371,277
Year 2012 (Member)
Net income (in Dollars)		3,780
Accumulated dividends on Series A Preferred Stock (in Dollars)		(125)
Accretion of Series A Preferred Stock discount (in Dollars)		(21)
Net income available to common shareholders (in Dollars)		$ 3,634
Weighted average number of common shares used in earnings per common share – basic		3,190,518
Stock option awards and Warrant		74,457
Weighted average number of common shares used in earnings per common share – assuming dilution		3,264,975