Note 7 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Stock-based compensation expense	$ 406	$ 441	$ 560	$ 711
Share-based Payment Arrangement, Option [Member]
Stock-based compensation expense	3	9	8	23
Restricted Stock [Member]
Stock-based compensation expense	$ 403	$ 432	$ 552	$ 688