Note 2 - Earnings Per Share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
BASIC
Net income	$ 6,402,405	$ 7,706,921	$ 7,265,717
Weighted average common shares outstanding (in shares)	10,077,506	10,203,063	10,176,492
Earnings per share – basic (in dollars per share)	$ 0.64	$ 0.76	$ 0.71
DILUTED
Net income	$ 6,402,405	$ 7,706,921	$ 7,265,717
Weighted average common shares outstanding (in shares)	10,077,506	10,203,063	10,176,492
Effect of restricted stock awards and assumed exercise of stock options (in shares)	25,254	38,058	39,946
Weighted average common shares outstanding, assuming dilution (in shares)	10,102,760	10,241,121	10,216,438
Earnings per share - diluted (in dollars per share)	$ 0.63	$ 0.75	$ 0.71
Outstanding options and restricted stock awards excluded as anti-dilutive (in shares)	60,433