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Debt Securities (Details 1)
$ in Thousands
Jan. 31, 2020
USD ($)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]  
Within one year $ 7,550
After one year through five years 1,200
After five years through ten years
After ten years
Total $ 8,750