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Note 8 - Stockholders' Equity - Schedule of Stock Option Award Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
$ / shares
shares
Mar. 31, 2024
USD ($)
$ / shares
shares
Options outstanding (in shares) | shares 194  
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 181.89  
Outstanding, Weighted- Average Remaining Contractual Life (Year) 2 years 10 months 24 days 3 years 2 months 12 days
Outstanding, Aggregate Intrinsic Value | $ $ 229 $ 26
Options granted (in shares) | shares 0  
Awards granted, weighted average exercise price (in dollars per share) | $ / shares $ 0  
Options forfeited or expired (in shares) | shares (14)  
Awards forfeited or expired, weighted average exercise price (in dollars per share) | $ / shares $ 147.9  
Awards exercised (in shares) | shares 0  
Awards exercised, weighted average exercise price (in dollars per share) | $ / shares $ 0  
Options outstanding (in shares) | shares 180 194
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 184.42 $ 181.89