REVENUE (Narrative) (Details)	Dec. 31, 2019 USD ($) a	Dec. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Accounts receivable	$ 3,824,000	$ 4,670,000
Contract liabilities	0	0
Receivables from contracts with customers
Disaggregation of Revenue [Line Items]
Accounts receivable	2,200,000	3,000,000
Other Current Liabilities
Disaggregation of Revenue [Line Items]
Performance deposits	905,000	500,000
Environmental Remediation and Other Long Term Liabilities
Disaggregation of Revenue [Line Items]
Performance deposits	$ 0	$ 300,000
Funds Timber
Disaggregation of Revenue [Line Items]
Area of land (in acres) | a	141,000
Real Estate
Disaggregation of Revenue [Line Items]
Area of land (in acres) | a	1,500
Timber Properties | Partnership Timber
Disaggregation of Revenue [Line Items]
Area of land (in acres) | a	119,000
Timber Deeds | Partnership Timber
Disaggregation of Revenue [Line Items]
Area of land (in acres) | a	3,500