Note 4 - Fair Value Measurements - Financial Assets and Liabilities (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Jul. 31, 2021	Jan. 31, 2021
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Cash and cash equivalents	$ 98,630	$ 80,611
Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member]
Cash and cash equivalents	12,453	9,262
Fair Value, Inputs, Level 2 [Member]
Liability related to the interest rate swap	(207)	(325)
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Liability related to the interest rate swap	(207)	(325)
Fair Value, Inputs, Level 2 [Member] | Promissory Note Issued for Acquisition [Member]
Note payable for FTZ Corp. acquisition	2,431
Fair Value, Inputs, Level 3 [Member]
Contingent liability associated with acquisitions	$ (6,217)	$ (4,751)