SHAREHOLDERS' EQUITY - (Summary of Stock Option Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, end of period (in dollars per share)	$ 4.01
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	38,850	39,017	50,351
Granted (in shares)	0	0	0
Exercised (in shares)	(13,433)	(167)	(10,834)
Cancelled (in shares)	0	0	(500)
Outstanding, end of period (in shares)	25,417	38,850	39,017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, beginning of period (in dollars per share)	$ 3.80	$ 3.80	$ 3.72
Weighted Average Option Exercise Price, Granted (in dollars per share)	0	0	0
Weighted Average Option Exercise Price, Exercised (in dollars per share)	3.16	2.45	3.47
Weighted Average Option Exercise Price, Cancelled (in dollars per share)	0	0	2.45
Outstanding, end of period (in dollars per share)	$ 4.01	$ 3.80	$ 3.80