RELATED-PARTY TRANSACTIONS AND ARRANGEMENTS (Schedule of Related Party Transaction) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Related Party Transaction [Line Items]
Distribution and stockholder fees payable	$ 64,000	$ 142,000	$ 64,000	$ 142,000
Advisors | Selling commissions
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	0	0	0	23,501
Advisors | Dealer manager fees
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	0	0	0	7,000
Advisors | Distribution and stockholder servicing fees
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	12,557	14,960	39,130	46,290
Advisors | Organization and offering costs
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 0	$ 0	$ 0	$ 6,571