Note 6 - Income Per Common Share - Income Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Basic Income Per Common Share	$ 1,256,152	$ 1,537,949	$ 2,532,757	$ 2,867,492
Basic Income Per Common Share (in shares)	4,366,507	4,334,288	4,363,375	4,324,811
Basic Income Per Common Share (in dollars per share)	$ 0.29	$ 0.35	$ 0.58	$ 0.66
Effect of Dilutive Securities (in shares)	53,977	54,038	52,028	56,405
Diluted Income Per Common Share	$ 1,256,152	$ 1,537,949	$ 2,532,757	$ 2,867,492
Diluted Income Per Common Share (in shares)	4,420,484	4,388,326	4,415,403	4,381,216
Diluted Income Per Common Share (in dollars per share)	$ 0.28	$ 0.35	$ 0.57	$ 0.65