DESCRIPTION OF BUSINESS AND PRINCIPLES OF INTERIM STATEMENTS - Commercial Loan Investments and Accounts Receivable (Details)	3 Months Ended	6 Months Ended
	Dec. 31, 2015 Transaction	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounts Receivable
Income Property Tenant Receivables		$ 1,915,168	$ 532,636
Accrued Property Tax Receivables, Increase (Decrease)		493,000
Income Property Tenant Receivables, Unpaid Receivables		$ 890,000
Income Property Tenant Receivables, Unpaid Receivables, Rents, No Agreement Reached, Percentage		7.00%
Number of closed land transactions | Transaction	2
Receivable from Golf operations for rounds surcharge		$ 499,000
Allowance for doubtful accounts		73,000	0
Other Assets
Accounts Receivable
Income Property Tenant Receivables		1,900,000	533,000
Income Property Tenant Receivables, Increase (Decrease)		1,400,000
Accounts receivable related to real estate operations		$ 1,600,000	$ 1,600,000