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 income (loss)	(8,676)	(579,814)	(588,490)	203,012	(385,478)
Net income (loss) (in Shares)		55,745
Noncontrolling interests of newly consolidated LLC’s				14,020,191	14,020,191
Contribution from noncontrolling interest				135,944	135,944
Partners’ distributions	(2,999)	(234,744)	(237,743)	(3,596)	(241,339)
Balances at Mar. 31, 2011	2,248,241	216,026,890	218,275,131	14,372,018	232,647,149
Balances (in Shares) at Mar. 31, 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 income (loss)	1,695	160,818	162,513	624,016	786,529
Change in ownership interests in consolidated LLC (Note 6)	28,150	2,731,617	2,759,767	(9,959,767)	(7,200,000)
Partners’ distributions	(1,365)	(132,285)	(133,650)	(4,362)	(138,012)
Balances at Mar. 31, 2012	$ 1,877,473	$ 181,957,116	$ 183,834,589	$ 8,179,715	$ 192,014,304
Balances (in Shares) at Mar. 31, 2012		278,605,524