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Statements of Changes in Shareholders' Deficit (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Shareholders' deficit - opening balance       $ (25,292,947)       $ (21,948,152) $ (25,292,947) $ (21,948,152) $ (16,913,610)
Net gain from operations 1,061,828 959,073 1,946,021 538,595 810,341 550,349 261,220 785,297 4,505,517 2,407,207 7,340,281
Adjustment of redeemable shares to redemption value                 17,807,576 (5,752,002) (12,374,823)
Shareholders' deficit - closing balance $ (2,979,854)       $ (25,292,947)       $ (2,979,854) $ (25,292,947) $ (21,948,152)