Note 7 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Stock-based compensation expense	$ 288	$ 315	$ 999	$ 1,018
Employee Stock Option [Member]
Stock-based compensation expense	5	21	28	80
Restricted Stock [Member]
Stock-based compensation expense	$ 283	$ 294	$ 971	$ 938