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Description of Beneficial Interests (Details Narrative) - shares
9 Months Ended
Jun. 19, 2017
Jan. 31, 2010
Sep. 15, 2009
Jan. 05, 2009
Sep. 10, 2007
Aug. 18, 2005
Sep. 10, 2002
Jan. 02, 2001
Oct. 31, 2020
Oct. 31, 2019
Apr. 30, 2019
Stock repurchase program, remaining number of shares authorized to be repurchased                 1.06   1.71
Stock repurchase program, number of shares authorized to be repurchased                 711,380    
Shares of Beneficial Interest [Member]                      
Stock repurchased during period, shares                 230,582 73,385  
Maximum [Member]                      
Number of units were available for sale 750,000 350,000 250,000 300,000 350,000 350,000 350,000 250,000