Other Financial Instruments and Fair Value Measurements (Details Textual) $ in Millions	Jul. 31, 2020 USD ($)
Other Financial Instruments and Fair Value Measurements (Textual) [Abstract]
Company's Municipal bond mature in 2021	$ 1.0
Company's Municipal bond mature in 2022	1.6
Company's Municipal bond mature in 2023	0.0
Company's Municipal bond mature in 2024	3.5
Company's Municipal bond mature in 2025 and beyond	$ 18.5