EARNINGS PER SHARE (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
EARNINGS PER SHARE [Abstract]
Net income for diluted computation	$ 2,658,549	$ 2,870,979	$ 1,757,204	$ 2,330,900	$ 1,919,242	$ 1,394,763	$ 577,966	$ 753,989	$ 9,617,632	$ 4,645,960	$ 5,285,847
Weighted average shares [Abstract]
Basic (in shares)									6,827,355	6,477,457	6,345,615
Effect of dilutive securities [Abstract]
Stock options (in shares)									445,634	602,113	576,659
Diluted (in shares)									7,272,989	7,079,570	6,922,274
Net income per share [Abstract]
Basic (in dollars per share)	$ 0.38	$ 0.42	$ 0.26	$ 0.35	$ 0.29	$ 0.21	$ 0.09	$ 0.12	$ 1.41	$ 0.72	$ 0.83
Diluted (in dollars per share)	$ 0.36	$ 0.39	$ 0.24	$ 0.32	$ 0.27	$ 0.20	$ 0.08	$ 0.11	$ 1.32	$ 0.66	$ 0.76
Potential common shares excluded from diluted loss per share calculation (in shares)									20,000	20,000	272,500