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Other Financial Instruments and Fair Value Measurements (Details Textual)
$ in Millions
Jul. 31, 2019
USD ($)
Other Financial Instruments and Fair Value Measurements (Textual) [Abstract]  
Company's Municipal bond mature in 2020 $ 0.3
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 1.0
Company's Municipal bond mature in 2024 and beyond $ 28.0