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Note 7 - Stockholders' Equity - Stock Option and Restricted Stock Unit Award Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Options outstanding (in shares) 253  
Options outstanding, weighted-average exercise price (in dollars per share) $ 129.55  
Outstanding, Weighted- Average Remaining Contractual Life (Year) 2 years 6 months 2 years 8 months 12 days
Outstanding, Aggregate Intrinsic Value $ 32,299 $ 28,856
Options granted (in shares) 0  
Options granted, weighted-average exercise price (in dollars per share) $ 0  
Options forfeited or expired (in shares) (2)  
Options forfeited or expired, weighted-average exercise price (in dollars per share) $ 170.93  
Options exercised or distributed (in shares) (19)  
Options exercised or distributed, weighted-average exercise price (in dollars per share) $ 96.18  
Options outstanding (in shares) 232 253
Options outstanding, weighted-average exercise price (in dollars per share) $ 131.90 $ 129.55