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Note 9 - Stock Transactions and Stock-based Compensation - Stock Option and Non-vested Stock Award Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Options outstanding (in shares) 194    
Options outstanding, weighted average exercise price (in dollars per share) $ 181.89    
Outstanding, Weighted- Average Remaining Contractual Life (Year) 2 years 8 months 12 days 3 years 2 months 12 days  
Outstanding, Aggregate Intrinsic Value $ 52 $ 26  
Options granted (in shares) 0    
Awards granted, weighted average exercise price (in dollars per share) $ 0    
Options forfeited or expired (in shares) (17)    
Awards forfeited or expired, weighted average exercise price (in dollars per share) $ 155.06    
Options exercised or distributed (in shares) (22)    
Awards exercised or distributed, weighted average exercise price (in dollars per share) $ 123.17    
Exercised, Aggregate Intrinsic Value $ 24 $ 24 $ 6,902
Options outstanding (in shares) 155 194  
Options outstanding, weighted average exercise price (in dollars per share) $ 192.92 $ 181.89  
Options exercisable (in shares) 112    
Exercisable, weighted average exercise price (in dollars per share) $ 211.36    
Exercisable, Weighted- Average Remaining Contractual Life (Year) 2 years 2 months 12 days    
Exercisable, Aggregate Intrinsic Value $ 18    
Exercisable and expected to vest (in shares) 153    
Exercisable and expected to vest, weighted average exercise price (in dollars per share) $ 193.71    
Exercisable and expected to vest, Weighted- Average Remaining Contractual Life (Year) 2 years 8 months 12 days    
Exercisable awards and awards expected to vest $ 49