Other Financial Instruments and Fair Value Measurements (Details Textual) $ in Millions	Jul. 31, 2021 USD ($)
Other Financial Instruments and Fair Value Measurements (Textual) [Abstract]
Company's Municipal bond mature in 2022	$ 1.8
Company's Municipal bond mature in 2023	0.0
Company's Municipal bond mature in 2024	2.2
Company's Municipal bond mature in 2025	3.0
Company's Municipal bond mature in 2026	2.0
Company's Municipal bond mature in 2027 and beyond	$ 15.2