Note 4 - Fair Value Measurements (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Feb. 01, 2018	Jan. 31, 2018	Jan. 31, 2017
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 138,080,000	$ 140,027,000	$ 138,080,000	$ 140,027,000	$ 147,023,000	$ 147,023,000	$ 145,082,000
Interest Rate Swap [Member]
Derivative, Gain (Loss) on Derivative, Net, Total	46,000	$ 106,000	198,000	$ 103,000
Reported Value Measurement [Member] | Money Market Funds [Member]
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 27,000,000		$ 27,000,000			$ 32,000,000