Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 6,004,304	$ 7,360,515
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	906,315	1,592,826
Gain on sale of real estate assets, net		(7,168,587)
Loss (gain) on derivatives, net of cash paid	(1,082,333)	121,349
Restricted unit compensation expense	206,636	170,840
Bond premium/discount amortization	(17,041)	(35,767)
Amortization of deferred financing costs	464,772	740,238
Deferred income tax expense & income tax payable	2,754	2,458,047
Change in preferred return receivable from unconsolidated entities	(877,995)	(581,772)
Changes in operating assets and liabilities, net of effect of acquisitions
Increase in interest receivable	(1,656,144)	(290,486)
Increase in other assets	(255,901)	(97,700)
Increase (decrease) in accounts payable and accrued expenses	(824,082)	612,007
Net cash provided by operating activities	2,871,285	4,881,510
Cash flows from investing activities:
Capital expenditures	(150,460)	(112,629)
Proceeds from sale of MF Properties		13,750,000
Acquisition of mortgage revenue bonds		(59,585,000)
Contributions to unconsolidated entities	(9,725,034)	(6,412,262)
Principal payments received on taxable mortgage revenue bonds	2,732	3,888
Cash paid for land held for development and deposits on potential purchases	(2,560,244)
Advances on property loans	(66,651)	(1,701,499)
Principal payments received on property loans	150,000	500,000
Net cash used in investing activities	(821,004)	(52,443,439)
Cash flows from financing activities:
Distributions paid	(9,116,720)	(8,289,468)
Proceeds from the sale of redeemable Series A Preferred Units		16,131,000
Repurchase of Beneficial Unit Certificates	(1,256,654)	(823,358)
Proceeds from the sale of Beneficial Unit Certificates	233,633
Payment of offering costs related to the sale of Beneficial Unit Certificates	(4,678)
Payment of tax withholding related to restricted unit awards		(153,306)
Distribution to noncontrolling interest		(76,316)
Proceeds from debt financing		135,100,000
Principal payments on debt financing	(8,303,677)	(31,593,250)
Principal payments on mortgages payable	(113,308)	(233,630)
Principal borrowing on unsecured lines of credit		22,460,000
Principal payments on unsecured and secured lines of credit		(82,460,000)
Increase (decrease) in security deposit liability related to restricted cash	3,449	(100,762)
Debt financing and other deferred costs		(1,215,213)
Net cash provided by (used in) financing activities	(18,557,955)	48,745,697
Net increase (decrease) in cash, cash equivalents and restricted cash	(16,507,674)	1,183,768
Cash, cash equivalents and restricted cash at beginning of period	71,583,329	27,506,220
Cash, cash equivalents and restricted cash at end of period	55,075,655	28,689,988
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	5,617,890	4,907,078
Cash paid during the period for income taxes	14,859
Supplemental disclosure of noncash investing and financing activities:
Distributions declared but not paid for Beneficial Unit Certificates and general partner	7,632,945	8,678,628
Distributions declared but not paid for Series A Preferred Units	708,750	320,823
Land contributed as investment in an unconsolidated entity	2,597,784	3,091,023
Capital expenditures financed through accounts payable	54,581	33,072
Deferred financing and equity issuance costs financed through accounts payable	6,222	46,764
Public housing capital fund trusts [Member]
Cash flows from investing activities:
Principal payments received	226,714
Mortgage Revenue Bonds [Member]
Cash flows from investing activities:
Principal payments received	$ 11,301,939	$ 1,114,063