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Description of Beneficial Interests (Details Narrative) - shares
12 Months Ended
Jan. 31, 2010
Sep. 15, 2009
Jan. 05, 2009
Sep. 10, 2007
Aug. 18, 2005
Sep. 10, 2002
Jan. 02, 2001
Jan. 31, 2017
Jan. 31, 2016
Number of units were available for sale 350,000 250,000 300,000 350,000 350,000 350,000 250,000    
Stock repurchased during period, shares                 68,265
Stock repurchase program, remaining number of shares authorized to be repurchased               2.55 2.67
Stock repurchase program, number of shares authorized to be repurchased               63,090  
Shares of Beneficial Interest [Member]                  
Stock repurchased during period, shares               30,227 34,602