Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Property revenues	$ 2,403,142	$ 3,306,722	$ 4,739,654	$ 7,036,500
Investment income	12,249,035	12,174,215	25,627,521	23,644,401
Contingent interest income		86,567		219,217
Other interest income	1,058,688	666,796	1,801,724	1,311,933
Other income	74,300		74,300	62,637
Total revenues	15,785,165	16,234,300	32,243,199	32,274,688
Expenses:
Real estate operating (exclusive of items shown below)	1,290,487	1,621,084	2,685,980	4,105,300
Impairment of securities	831,062		831,062
Depreciation and amortization	921,816	1,270,379	1,828,131	2,863,205
Amortization of deferred financing costs	430,687	562,585	895,459	1,302,823
Interest expense	5,918,867	5,841,327	10,801,172	11,283,580
General and administrative	3,041,125	2,876,450	5,852,970	6,007,330
Total expenses	12,434,044	12,171,825	22,894,774	25,562,238
Other Income:
Gain (loss) on sale of real estate assets, net		(16,075)		7,152,512
Income before income taxes	3,351,121	4,046,400	9,348,425	13,864,962
Income tax expense (benefit)	13,000	(63,000)	6,000	2,395,047
Net income	3,338,121	4,109,400	9,342,425	11,469,915
Net income attributable to noncontrolling interest				71,653
Partnership net income	3,338,121	4,109,400	9,342,425	11,398,262
Redeemable Series A preferred unit distributions and accretion	(717,762)	(432,550)	(1,435,525)	(757,192)
Net income available to Partners	2,620,359	3,676,850	7,906,900	10,641,070
Net income available to Partners and noncontrolling interest allocated to:
General Partner	26,204	35,139	79,069	1,182,211
Net income attributable to noncontrolling interest				71,653
Net income available to Partners and noncontrolling interest	$ 2,620,359	$ 3,676,850	$ 7,906,900	$ 10,712,723
Unitholders' interest in net income per Unit, basic and diluted	$ 0.04	$ 0.06	$ 0.13	$ 0.16
Distributions declared, per Unit	$ 0.125	$ 0.125	$ 0.25	$ 0.25
Weighted average number of Units outstanding, basic	59,937,300	59,862,969	60,030,817	59,950,328
Weighted average number of Units outstanding, diluted	59,937,300	59,862,969	60,030,817	59,950,328
Unitholders [Member]
Net income available to Partners and noncontrolling interest allocated to:
Limited Partners	$ 2,530,332	$ 3,594,529	$ 7,729,733	$ 9,389,231
Restricted Unitholders [Member]
Net income available to Partners and noncontrolling interest allocated to:
Limited Partners	$ 63,823	$ 47,182	$ 98,098	$ 69,628