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Note 7 - Stock-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended 12 Months Ended
Jul. 31, 2021
Jan. 31, 2021
Exercised (in shares) 0  
Expired or forfeited (in shares) 0  
Share-based Payment Arrangement, Option [Member]    
Outstanding beginning of period (in shares) 107  
Outstanding at beginning of period, weighted average exercise price (in dollars per share) $ 9.24  
Outstanding weighted average remaining contractual term (Year) 2 years 2 months 12 days 2 years 6 months
Outstanding at beginning of period, aggregate intrinsic value $ 17 $ 5
Exercised (in shares) 0  
Exercised, weighted average exercise price (in dollars per share) $ 0  
Expired or forfeited (in shares) (15)  
Expired or forfeited, weighted average exercise price (in dollars per share) $ 7.69  
Outstanding end of period (in shares) 92 107
Outstanding at end of period, weighted average exercise price (in dollars per share) $ 9.50 $ 9.24
Options exercisable (in shares) 92  
Options exercisable, weighted average exercise price (in dollars per share) $ 9.50  
Options exercisable, weighted average remaining contractual term (Year) 2 years 2 months 12 days  
Options exercisable, aggregate intrinsic value $ 17