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Note 8 - Stockholders' Equity - Stock Option and Non-vested Stock Award Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
$ / shares
shares
Mar. 31, 2023
USD ($)
$ / shares
shares
Options outstanding (in shares) | shares 163  
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 200.62  
Outstanding, Weighted- Average Remaining Contractual Life (Year) 3 years 8 months 12 days 3 years 3 months 18 days
Outstanding, Aggregate Intrinsic Value | $ $ 0 $ 1,643
Options granted (in shares) | shares 53  
Awards granted, weighted average exercise price (in dollars per share) | $ / shares $ 131.67  
Options forfeited or expired (in shares) | shares (15)  
Awards forfeited or expired, weighted average exercise price (in dollars per share) | $ / shares $ 213.22  
Awards exercised (in shares) | shares (2)  
Awards exercised, weighted average exercise price (in dollars per share) | $ / shares $ 132.4  
Options outstanding (in shares) | shares 199 163
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 181.9 $ 200.62