DESCRIPTION OF BUSINESS AND PRINCIPLES OF INTERIM STATEMENTS - Accounts Receivable (Details)	3 Months Ended
	Dec. 31, 2015 Transaction	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Accounts Receivable
Income Property Tenant Receivables		$ 991,146	$ 627,691
Number of closed land transactions | Transaction	2
Allowance for doubtful accounts		217,000	185,000
Other Assets
Accounts Receivable
Income Property Tenant Receivables		1,000,000	628,000
Accounts receivable related to real estate operations		1,800,000	1,800,000
Assets Held for Sale
Accounts Receivable
Golf Operations Receivables		$ 347,000	$ 290,000