Consolidated Statements of Partners' Capital (USD $)	Total USD ($)	General Partner USD ($)	Number of Units	Beneficial Unit Certificate Holders USD ($)	Unallocated Deficit of Consolidated Variable Interest Entities USD ($)	Noncontrolling Interest USD ($)	Accumulated Other Comprehensive Income (Loss) USD ($)
Balance at Dec. 31, 2009	$ 98,600,740	$ 271,051		$ 130,482,881	$ (32,215,697)	$ 62,505	$ (11,009,231)
Partners' Capital Account, Units at Dec. 31, 2009			21,842,928
Sale of Beneficial Unit Certificates, Units			8,280,000
Sale of Beneficial Unit Certificates	41,591,576			41,591,576
Deconsolidation of VIEs - Note 4	3,324,354	15,881		1,572,185	1,736,288		1,588,066
Consolidation of VIEs	2,752,283	27,523		2,724,760			2,752,283
Distributions paid or accrued
Regular Distribution, 2010 and 2011 and Distributions paid or accrued, 2009	(12,756,581)	(127,566)		(12,629,015)
Distribution of tier II earnings - Note 2	(1,863,265)	(465,816)		(1,397,449)
Net income (loss)	(604,191)	28,532		2,037,368	(2,466,260)	(203,831)
Unrealized Gain (Loss) on Securities	(3,023,351)	(30,234)		(2,993,117)			(3,023,351)
Balance at Dec. 31, 2010	128,021,565	(280,629)		161,389,189	(32,945,669)	(141,326)	(9,692,233)
Partners' Capital Account, Units at Dec. 31, 2010			30,122,928
Deconsolidation of VIEs - Note 4	9,996,003	(7,262)		(718,981)	10,722,246		(726,243)
Limited Partners Interest in Ohio Properties	115,352	0		0		115,352
Distributions paid or accrued
Regular Distribution, 2010 and 2011 and Distributions paid or accrued, 2009	(14,710,486)	(154,969)		(14,555,517)
Distribution of tier II earnings - Note 2	(674,596)	(168,649)		(505,947)
Net income (loss)	(1,673,163)	152,359		(1,106,742)	(1,289,539)	570,759
Unrealized Gain (Loss) on Securities	10,514,370	105,144		10,409,226			10,514,370
Balance at Dec. 31, 2011	131,589,045	(354,006)		154,911,228	(23,512,962)	544,785	95,894
Partners' Capital Account, Units at Dec. 31, 2011			30,122,928
Sale of Beneficial Unit Certificates, Units			12,650,000
Sale of Beneficial Unit Certificates	60,003,863			60,003,863
Limited Partners Interest in Ohio Properties	959,760					959,760
Distributions paid or accrued
Regular Distribution, 2010 and 2011 and Distributions paid or accrued, 2009	(18,011,532)	(180,115)		(17,831,417)
Distribution of tier II earnings - Note 2	(2,631,730)	(657,933)		(1,973,797)
Net income (loss)	4,996,038	691,312		5,278,378	(1,522,846)	549,194
Unrealized Gain (Loss) on Securities	7,065,487	70,655		6,994,832			7,065,487
Balance at Dec. 31, 2012	$ 183,970,931	$ (430,087)		$ 207,383,087	$ (25,035,808)	$ 2,053,739	$ 7,161,381
Partners' Capital Account, Units at Dec. 31, 2012			42,772,928