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Cash Flow Information (Details) - USD ($)
6 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Cash Flow Information: [Abstract]    
Interest paid, net of capitalized interest of $18,127 (2016) and $5,359 (2015) $ 123,677 $ 233,622
Income taxes paid 23,654 323,926
Capitalized interest $ 18,127 $ 5,359