Note 4 - Fair Value Measurements (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 133,815,000	$ 138,080,000	$ 133,815,000	$ 138,080,000	$ 139,413,000	$ 147,023,000
Interest Rate Swap [Member]
Derivative, Gain (Loss) on Derivative, Net, Total	(101,000)	$ 46,000	(352,000)	$ 198,000
Reported Value Measurement [Member]
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 25,900,000		$ 25,900,000		$ 31,600,000