Note 3 - Fair Value Measurements (Details Textual) - USD ($)	6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
Cash and Cash Equivalents, at Carrying Value	$ 149,202,000	$ 134,708,000	$ 145,082,000	$ 137,731,000
Interest Rate Swap [Member]
Derivative, Gain (Loss) on Derivative, Net	(3,000)	$ (212,000)
Reported Value Measurement [Member]
Cash and Cash Equivalents, at Carrying Value	$ 28,000,000		$ 29,000,000