Note 3 - Fair Value Measurements (Details Textual) - USD ($)	9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
Cash and Cash Equivalents, at Carrying Value	$ 140,027,000	$ 135,689,000	$ 145,082,000	$ 137,731,000
Interest Rate Swap [Member]
Derivative, Gain (Loss) on Derivative, Net	(103,000)	$ (31,000)
Reported Value Measurement [Member]
Cash and Cash Equivalents, at Carrying Value	$ 25,000,000		$ 29,000,000