DESCRIPTION OF BUSINESS AND PRINCIPLES OF INTERIM STATEMENTS - Commercial Loan Investments and Accounts Receivable (Details)	3 Months Ended
	Mar. 31, 2020 USD ($)	Dec. 31, 2015 Transaction	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounts Receivable
Income Property Tenant Receivables			$ 2,852,893	$ 532,636
Accrued Property Tax Receivables, Increase (Decrease)	$ 1,100,000
Income Property Tenant Receivables, Unpaid Receivables	$ 1,200,000
Income Property Tenant Receivables, Unpaid Receivables, Rents, No Agreement Reached, Percentage	6.00%
Number of closed land transactions | Transaction		2
Allowance for doubtful accounts			49,000	14,000
Other Assets
Accounts Receivable
Income Property Tenant Receivables			2,900,000	533,000
Income Property Tenant Receivables, Increase (Decrease)	$ 2,300,000
Accounts receivable related to real estate operations			1,600,000	$ 1,600,000
Receivable from Golf operations for rounds surcharge			$ 477,000