CASH FLOW INFORMATION (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CASH FLOW INFORMATION
Cash paid for interest	$ 13,307,000	$ 11,876,000	$ 12,243,000
Cash paid for state income taxes	100,000	80,000	$ 76,000
Non-cash financing activities in connection with refinancing	$ 2,393,000
Non-cash financing activities in connection with acquisition		$ 31,000,000