Consolidated Statements of Partners' Capital (Unaudited) (USD $)	General Partner Capital [Member]	Limited Partners' Capital [Member]	Total OMIF Partners' Capital [Member]	Noncontrolling Interest [Member]	Total
Balances at Dec. 31, 2010	$ 2,259,916	$ 216,841,448	$ 219,101,364	$ 16,467	$ 219,117,831
Balances (in Shares) at Dec. 31, 2010		290,019,136
Net (loss) income	(17,744)	(1,504,967)	(1,522,711)	485,748	(1,036,963)
Net (loss) income (in Shares)		55,745
Noncontrolling interests of newly consolidated VIE				14,020,191	14,020,191
Contribution from noncontrolling interest				135,944	135,944
Partners’ income distributions	(8,467)	(764,698)	(773,165)	(9,228)	(782,393)
Balances at Jun. 30, 2011	2,233,705	214,571,783	216,805,488	14,649,122	231,454,610
Balances (in Shares) at Jun. 30, 2011		290,074,881
Balances at Dec. 31, 2011	1,848,993	179,196,966	181,045,959	17,519,828	198,565,787
Balances (in Shares) at Dec. 31, 2011		278,605,524
Net (loss) income	(8,867)	(862,861)	(871,728)	556,437	(315,291)
Change in ownership interests in consolidated LLC (Note 5)	28,150	2,731,617	2,759,767	(9,959,767)	(7,200,000)
Partners’ income distributions	(2,905)	(281,472)	(284,377)	(8,662)	(293,039)
Balances at Jun. 30, 2012	$ 1,865,371	$ 180,784,250	$ 182,649,621	$ 8,107,836	$ 190,757,457
Balances (in Shares) at Jun. 30, 2012		278,605,524