Cash Flow Information (Details) - USD ($) |
9 Months Ended | |
|---|---|---|
Apr. 30, 2018 |
Apr. 30, 2017 |
|
| Supplemental Cash Flow Elements [Abstract] | ||
| Interest paid, net of capitalized interest of $23,609 (2018) and $16,514 (2017) | $ 175,718 | $ 163,022 |
| Income taxes paid | 31,994 | |
| Capitalized interest | $ 23,609 | $ 16,514 |