EARNINGS PER SHARE (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
EARNINGS PER SHARE [Abstract]
Net income for diluted computation	$ 2,916,807	$ 3,053,593	$ 2,572,715	$ 2,829,124	$ 2,658,549	$ 2,870,979	$ 1,757,204	$ 2,330,900	$ 11,372,239	$ 9,617,632	$ 4,645,960
Weighted average shares [Abstract]
Basic (in shares)									7,061,404	6,827,355	6,477,457
Effect of dilutive securities [Abstract]
Stock options (in shares)									221,858	445,634	602,113
Diluted (in shares)									7,283,262	7,272,989	7,079,570
Net income per share [Abstract]
Basic (in dollars per share)	$ 0.41	$ 0.43	$ 0.37	$ 0.40	$ 0.38	$ 0.42	$ 0.26	$ 0.35	$ 1.61	$ 1.41	$ 0.72
Diluted (in dollars per share)	$ 0.40	$ 0.42	$ 0.35	$ 0.39	$ 0.36	$ 0.39	$ 0.24	$ 0.32	$ 1.56	$ 1.32	$ 0.66
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares excluded from diluted loss per share calculation (in shares)									20,000	20,000	20,000