Note 3 - Fair Value Measurements (Details Textual) - USD ($)	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Jan. 31, 2017	Jan. 31, 2016
Cash and Cash Equivalents, at Carrying Value	$ 153,348,000	$ 139,878,000	$ 145,082,000	$ 137,731,000
Interest Rate Swap [Member]
Derivative, Gain (Loss) on Derivative, Net	13,000	$ (31,000)
Reported Value Measurement [Member]
Cash and Cash Equivalents, at Carrying Value	$ 31,000,000		$ 29,000,000