STOCK-BASED COMPENSATION PLANS - Stock Options Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares Under Option
Outstanding at Beginning of Period	0
Granted	0	0
Outstanding at End of Period	0	0
2016 Stock Incentive Plan
Shares Under Option
Outstanding at Beginning of Period		0	11,000
Granted			0
Exercised			(10,000)
Forfeited and cancelled			(1,000)
Outstanding at End of Period			0
Options exercisable at year end			0
Weighted Average Exercise Price
Outstanding at Beginning of Period		$ 0	$ 5.49
Granted			0
Exercised			5.49
Forfeited and cancelled			5
Outstanding at End of Period			0
Options exercisable at year end			$ 0