Cash Management Agreement with Affiliate (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Cash Management Agreement with Affiliate [Abstract]
Cash and cash equivalents on deposit with affiliate	$ 6,450,721		$ 8,659,507
Fixed income securities held by affiliate	10,771,369		11,003,681
Advisory fees paid to affiliate	$ 8,925	$ 15,319
Annual fee	0.20%
Description of daily fee rate calculated and accrued	RJOIM is paid an annual fee, currently 0.20%, calculated and accrued daily at a rate equal to 1/360 of the principal balance of the Trust?s deposits held by RJOIM.