Note 2 - Fair Value Measurements (Details Textual) - USD ($)	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Cash and Cash Equivalents, at Carrying Value	$ 147,023,000	$ 145,082,000	$ 137,731,000	$ 120,526,000
Interest Rate Swap [Member]
Derivative, Gain (Loss) on Derivative, Net	377,000	485,000	$ (48,000)
Reported Value Measurement [Member]
Cash and Cash Equivalents, at Carrying Value	$ 32,000,000	$ 29,000,000