DESCRIPTION OF BUSINESS AND PRINCIPLES OF INTERIM STATEMENTS - Commercial Loan Investments and Accounts Receivable (Details)	3 Months Ended
	Dec. 31, 2015 Transaction	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounts Receivable
Income Property Tenant Receivables		$ 1,410,941	$ 532,636
Number of closed land transactions | Transaction	2
Receivable from Golf operations for rounds surcharge		527,000
Allowance for doubtful accounts		49,000	14,000
Other Assets
Accounts Receivable
Income Property Tenant Receivables		1,400,000	533,000
Accrued receivables related to property taxes		878,000
Accounts receivable related to real estate operations		$ 1,600,000	$ 1,600,000