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Note 8 - Stockholders' Equity - Stock Option and Non-vested Stock Award Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Options outstanding (in shares) 163  
Options outstanding, weighted average exercise price (in dollars per share) $ 200.62  
Outstanding, Weighted- Average Remaining Contractual Life (Year) 3 years 9 months 18 days 3 years 3 months 18 days
Outstanding, Aggregate Intrinsic Value $ 119 $ 1,643
Options granted (in shares) 53  
Awards granted, weighted average exercise price (in dollars per share) $ 131.67  
Options forfeited or expired (in shares) (2)  
Awards forfeited or expired, weighted average exercise price (in dollars per share) $ 182.34  
Awards exercised (in shares) 0  
Awards exercised, weighted average exercise price (in dollars per share) $ 0  
Options outstanding (in shares) 214 163
Options outstanding, weighted average exercise price (in dollars per share) $ 183.64 $ 200.62