Note 3 - Fair Value Measurements (Details Textual) - USD ($)	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 142,501,000	$ 136,717,000	$ 139,413,000	$ 147,023,000
Interest Rate Swap [Member]
Derivative, Gain (Loss) on Derivative, Net, Total	(93,000)	(368,000)	$ (51,000)
Reported Value Measurement [Member]
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 52,600,000	$ 14,500,000