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Note 10 - Stock-based Compensation - Activities Within the Stock Option Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 19, 2023
Jul. 14, 2023
Mar. 31, 2024
Mar. 31, 2023
Number of options Beginning Balance     740,957  
Number of Options Granted 161,168 446,502 607,670  
Number of Options Exercised     (12,500)  
Number of Options Forfeited/Cancelled     (614,334)  
Number of options, Ending Balance     721,793 740,957
Number of Options Exercisable     312,924  
Weighted average exercise price Beginning balance     $ 13.6  
Weighted averageexercise price, Granted     2.5  
Weighted average exercise price, Exercised     1.27  
Weighted average exercise price, Forfeited/Cancelled     12.89  
Weighted average exercise price Ending balance     3.68 $ 13.6
Weighted average exercise price, Exercisable     $ 4.65  
Outstanding Remaining Contractual Term (years)     9 years 29 days 8 years 2 months 8 days
Exercisable Remaining Contractual Term (years)     8 years 10 months 2 days  
Aggregate Intrinsic Value Beginning     $ 8,121  
Aggregate Intrinsic Value Closing     527 $ 8,121
Aggregate Intrinsic Value, Exercisable     $ 188