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Condensed Statements of Income (USD $)
3 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Revenues    
Royalty income $ 3,693,121 $ 3,276,589
Interest income 325 1,459
Total revenues 3,693,446 3,278,048
Expenses 323,554 214,787
Net income $ 3,369,892 $ 3,063,261
Number of units outstanding (in units) 13,120,010 13,120,010
Net income per unit (Note 2) (in dollars per unit) $ 0.2569 $ 0.2335
Distributions declared per unit (Note 3) (in dollars per unit) $ 0.0650 $ 0.0500