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Note 17 - Stockholders' Equity - Options Activities (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Outstanding, options (in shares) 98,013  
Outstanding, weighted-average exercise price (in dollars per share) $ 28.22  
Granted (in shares) 20,564 0
Granted, weighted-average exercise price (in dollars per share) $ 5.92  
Exercised (in shares) 0  
Exercised, weighted-average exercise price (in dollars per share) $ 0  
Canceled/forfeited, options (in shares) (37,572)  
Canceled/forfeited, weighted-average exercise price (in dollars per share) $ 40.42  
Outstanding, options (in shares) 81,005 98,013
Outstanding, weighted-average exercise price (in dollars per share) $ 16.90 $ 28.22
Outstanding, weighted-average remaining contractual term (Year) 3 years 4 months 24 days  
Outstanding, aggregate intrinsic value $ 0  
Exercisable, options (in shares) 60,441  
Exercisable, weighted-average exercise price (in dollars per share) $ 20.63  
Exercisable, weighted-average remaining contractual term (Year) 1 year 4 months 24 days  
Fully vested and expected to vest, options (in shares) 80,274  
Fully vested and expected to vest, weighted-average exercise price (in dollars per share) $ 17.00  
Fully vested and expected to vest, weighted-average remaining contractual term (Year) 3 years 3 months 18 days  
Fully vested and expected to vest, aggregate intrinsic value $ 0