Note 18 - Stock Option Plans - Stock Option Activiy (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
Outstanding, number of shares (in shares)	2,586
Outstanding, weighted average exercise price (in dollars per share)	$ 4.09
Outstanding, weighted average remaining contractual term (Year)	6 years 6 months 29 days	6 years 6 months 29 days
Outstanding, intrinsic value	$ 100	$ 222
Granted, number of shares (in shares)	875
Granted, weighted average exercise price (in dollars per share)	$ 1.97
Exercised, number of shares (in shares)	0	0
Exercised, weighted average exercise price (in dollars per share)	$ 0
Forfeited, number of shares (in shares)	(10)
Forfeited, weighted average exercise price (in dollars per share)	$ 3.79
Expired, number of shares (in shares)	(26)
Expired, weighted average exercise price (in dollars per share)	$ 6.28
Outstanding, number of shares (in shares)	3,425	2,586
Outstanding, weighted average exercise price (in dollars per share)	$ 3.53	$ 4.09
Exercisable, number of shares (in shares)	2,158
Exercisable, weighted average exercise price (in dollars per share)	$ 4.34
Exercisable, weighted average remaining contractual term (Year)	5 years 2 months 8 days
Exercisable, intrinsic value	$ 0
Vested and expected to vest, number of shares (in shares)	3,361
Vested and expected to vest, weighted average exercise price (in dollars per share)	$ 3.60
Vested and expected to vest, weighted average remaining contractual term (Year)	6 years 6 months 14 days
Vested and expected to vest, intrinsic value	$ 99