EMPLOYEE STOCK OPTION PLAN (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options exercised under the plan (in shares)	191,804	41,141	318,750
Stock options, number of shares [Roll forward]
Exercised (in shares)	191,804	41,141	318,750
Stock options, weighted average exercise price per share [Roll Forward]
Exercised (in dollars per share)			$ 1.04
Stock options, additional disclosure [Abstract]
Outstanding, aggregate intrinsic value, end of period	$ 1,463,052
Exercisable, aggregate intrinsic value, end of period	731,997
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	$ 304,100	$ 334,400	$ 447,100
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options outstanding under the plan (in shares)	649,478	691,869	691,869	656,398	600,549	649,478	691,869
Number of stock options exercised under the plan (in shares)	191,804	41,141	318,750
Weighted average estimated grant-date fair value of stock options granted (in dollars per share)	$ 2.75		$ 3.52
Assumptions made in calculating fair values of options [Abstract]
Expected volatility minimum	45.78%		61.50%
Expected volatility maximum			96.10%
Risk-free interest rate minimum	0.92%		0.83%
Risk-free interest rate minimum			1.52%
Stock options, number of shares [Roll forward]
Outstanding, beginning of period (in shares)	649,478	691,869	656,398
Granted (in shares)	142,875	0	379,750
Exercised (in shares)	191,804	41,141	318,750
Forfeited/expired/cancelled (in shares)	0	1,250	25,529
Outstanding, end of period (in shares)	600,549	649,478	691,869	656,398
Exercisable, end of period (in shares)	267,549	359,228	265,619
Stock options, weighted average exercise price per share [Roll Forward]
Outstanding, beginning of period (in dollars per share)	$ 3.75	$ 3.66	$ 2.57
Granted (in dollars per share)	7.08	0	3.52
Exercised (in dollars per share)	3.73	2.25	1.04
Forfeited/expired/cancelled (in dollars per share)	0	4.30	3.17
Outstanding, end of period (in dollars per share)	4.55	3.75	3.66	$ 2.57
Exercisable, end of period (in dollars per share)	$ 4.14	$ 3.89	$ 3.67
Stock options, additional disclosure [Abstract]
Outstanding, weighted average remaining contractual term	3 years 5 months 5 days	3 years 2 months 16 days	3 years 11 months 19 days	1 year 7 months 24 days
Exercisable, weighted average remaining contractual term	2 years 7 months 28 days	2 years 11 days	1 year 11 months 19 days
Outstanding, aggregate intrinsic value, beginning of period	$ 1,032,362	$ 334,636	$ 801,888
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	629,143	65,449	341,729
Outstanding, aggregate intrinsic value, end of period	1,463,052	1,032,362	334,636	$ 801,888
Exercisable, aggregate intrinsic value, end of period	$ 731,997	$ 522,039	$ 158,149
Net unrecognized compensation cost					$ 386,000	$ 297,000	$ 631,000
Weighted average period for recognition of net unrecognized compensation cost	2 years 3 months 25 days	2 years 18 days	2 years 4 months 17 days
Total fair value of stock options vested during period	$ 262,000	$ 357,000	$ 283,000
Stock Options [Member] | Minimum [Member]
Assumptions made in calculating fair values of options [Abstract]
Expected term	4 years 8 months 16 days		4 years 6 months
Stock Options [Member] | Maximum [Member]
Assumptions made in calculating fair values of options [Abstract]
Expected term			6 years 3 months 18 days
2008 Stock Incentive Plan [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan (in shares)					750,000			625,000
Increase in number of shares authorized (in shares)	125,000
Number of stock options outstanding under the plan (in shares)	275,931				275,931
Number of stock options exercised under the plan (in shares)	467,685
Options still available to be issued (in shares)					6,384
Stock options, number of shares [Roll forward]
Exercised (in shares)	467,685
Outstanding, end of period (in shares)	275,931
2014 Stock Incentive Plan [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan (in shares)							800,000
Number of stock options outstanding under the plan (in shares)	117,750				117,750
Number of stock options exercised under the plan (in shares)	12,000
Options still available to be issued (in shares)					670,250
Stock options, number of shares [Roll forward]
Exercised (in shares)	12,000
Outstanding, end of period (in shares)	117,750
Cost of Goods Sold [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	$ 0	0	$ 700
Research and Development Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	89,200	62,700	44,500
Selling, General and Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	$ 214,900	$ 271,700	$ 401,900