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Note 5 - Accrued Expenses and Other Current Liabilities - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Jan. 31, 2021
Oct. 31, 2020
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]    
Earn-out liability $ 296 $ 370