Note 5 - Accrued Expenses and Other Long-term Liabilities - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring [Member] $ in Thousands	Apr. 30, 2020 USD ($)
Fair Value, Inputs, Level 1 [Member]
Earn-out liability
Fair Value, Inputs, Level 2 [Member]
Earn-out liability
Fair Value, Inputs, Level 3 [Member]
Earn-out liability	$ 869