SHAREHOLDERS' EQUITY - Share-based Compensation, Stock Options, Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Options
Outstanding beginning balance (in shares)	450,000	613,000	615,000	450,000	613,000	615,000
Granted (in shares)	18,000	16,000
Exercised (in shares)	(16,000)	0	(4,000)
Forfeited (in shares)	(165,000)	(18,000)
Outstanding ending balance (in shares)	450,000	613,000	615,000
Number of Options, Exercisable (in shares)				425,000	488,000
Weighted Average Exercise Price
Weighted Average Exercise Price, Beginning balance (in dollars per share)	$ 2.85	$ 2.87
Weighted Average Exercise Price, Granted (in dollars per share)	2.87	2.68
Weighted Average Exercise Price, Exercised (in dollars per share)	2.59
Weighted Average Exercise Price, Forfeited (in dollars per share)	3.07	3.15
Weighted Average Exercise Price, Ending balance (in dollars per share)	$ 2.78	$ 2.85	$ 2.87
Weighted Average Exercise Price, Exercisable (in dollars per share)				$ 2.79	$ 2.87
Weighted Average Remaining Contractual Term (Years)
Weighted Average Remaining Contractual Term (Years)	2 years 5 months 8 days	3 years 1 month 20 days	3 years 5 months 23 days
Weighted Average Remaining Contractual Term (Years) Granted	7 years	6 years 5 months 15 days
Weighted Average Remaining Contractual Term (Years), Exercisable	2 years 3 months	2 years 6 months 18 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Balance				$ 27,000	$ 0	$ 22,000
Aggregate Intrinsic Value, Exercisable				$ 0	$ 0