Note 6 - Income Per Common Share (Details) - Income Per Share - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Per Share [Abstract]
Basic income per common share, income available to common shareholders (in Dollars)	$ 1,537,949	$ 1,227,683	$ 2,867,493	$ 2,282,899
Basic income per common share, average common shares outstanding	4,334,288	4,265,050	4,324,811	3,718,791
Basic income per common share, per common share (in Dollars per share)	$ 0.35	$ 0.29	$ 0.66	$ 0.61
Effect of dilutive securities, average common shares outstanding	54,038	72,430	56,405	72,988
Diluted income per common share, income available to common shareholders (in Dollars)	$ 1,537,949	$ 1,227,683	$ 2,867,493	$ 2,282,899
Diluted income per common share, average common shares outstanding	4,388,326	4,337,480	4,381,216	3,791,779
Diluted income per common share, per common share (in Dollars per share)	$ 0.35	$ 0.28	$ 0.65	$ 0.60