Condensed Consolidated Statements of Partners' Capital - USD ($)	Total	General Partner	Number of Units	Beneficial Unit Certificate Holders	Unallocated Deficit of Consolidated VIEs	Noncontrolling Interest	Accumulated Other Comprehensive Income (Loss) [Member]
Stock Issued During Period, Shares, New Issues			9,200,000
Proceeds from Issuance of Common Stock	$ 51,288,699			$ 51,288,699	$ 0	$ 0	$ 0
Available-for-sale Securities, Gross Realized Gain (Loss)	(2,413,713)	$ (24,137)		(2,389,576)	$ 0		(2,413,713)
Gain (Loss) on Sales of Mortgage Backed Securities (MBS)	259,949	2,599		257,350			259,949
Balance at Dec. 31, 2013	203,122,765	16,671		223,573,312	$ (20,455,896)	(11,322)	(20,128,314)
Partners' Capital Account, Units at Dec. 31, 2013			51,052,928
Distributions paid or accrued	(23,722,091)	(1,127,243)		(22,594,848)	0	0	0
Net income (loss)	13,009,489	1,024,350		12,408,450	(419,685)	(3,626)	0
Unrealized Gain (Loss) on Securities	52,089,784	520,898		51,568,886	0	0	52,089,784
Balance at Sep. 30, 2014	301,456,000	491,349		321,855,180	(20,875,581)	(14,948)	37,628,824
Partners' Capital Account, Units at Sep. 30, 2014			60,252,928
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	7,821,118	78,211		7,742,907	0	0	7,821,118
Available-for-sale Securities, Gross Realized Gain (Loss)	(630,919)	(6,309)		(624,610)	0		(630,919)
Balance at Dec. 31, 2014	309,927,904	578,238		330,457,117	(21,091,456)	(15,995)	51,698,418
Partners' Capital Account, Units at Dec. 31, 2014			60,252,928
Distributions paid or accrued	(23,939,508)	(1,344,660)		(22,594,848)	0	0	0
Noncontrolling Interest, Period Increase (Decrease)	24,282	0		0	0	24,282	0
Net income (loss)	13,285,447	1,238,647		12,099,653	(51,901)	(952)	0
Unrealized Gain (Loss) on Securities	3,231,214	32,312		3,198,902	0	0	3,231,214
Balance at Sep. 30, 2015	299,453,933	473,783		320,116,172	(21,143,357)	7,335	51,854,226
Partners' Capital Account, Units at Sep. 30, 2015			60,252,928
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	$ (2,444,487)	$ (24,445)		$ (2,420,042)	$ 0	$ 0	$ (2,444,487)