Note 3 - Fair Value Measurements (Details Textual) - USD ($)	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 136,717,000	$ 139,413,000	$ 147,023,000	$ 145,082,000
Interest Rate Swap [Member]
Derivative, Gain (Loss) on Derivative, Net, Total	368,000	51,000	$ 377,000
Reported Value Measurement [Member]
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 14,500,000	$ 22,600,000