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Note 5 - Accrued Expenses and Other Long-term Liabilities - Level 3 Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 31, 2020
Apr. 30, 2020
Jan. 31, 2020
Oct. 31, 2019
Beginning balance $ 869 $ 1,215 $ 1,249
Change in value (311) (346) (34)
Ending balance $ 558 $ 869 $ 1,215