Note 4 - Fair Value Measurements (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020	Jan. 31, 2021
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 136,489,000		$ 136,489,000		$ 142,501,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			893,000	$ 0
Interest Rate Swap [Member]
Derivative, Gain (Loss) on Derivative, Net, Total	54,000	$ 32,000	118,000	$ (219,000)
General and Administrative Expense [Member]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	900,000		900,000
Reported Value Measurement [Member]
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 25,400,000		$ 25,400,000		$ 52,600,000