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Note 7 - Stockholders' Equity - Stock Option and Restricted Stock Unit Award Activity (Details) - $ / shares
 3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Options outstanding (in shares)   354,000
Options outstanding, weighted-average exercise price (in dollars per share)   $ 94.04
Options granted (in shares)   29,000
Options granted, weighted-average exercise price (in dollars per share)   $ 205.87
Options forfeited or expired (in shares)   (28,000)
Options forfeited or expired, weighted-average exercise price (in dollars per share)   $ 99.69
Options exercised or distributed (in shares)   (42,000)
Options exercised or distributed, weighted-average exercise price (in dollars per share)   $ 85.35
Options outstanding (in shares) 313,000 313,000
Options outstanding, weighted-average exercise price (in dollars per share) $ 105.03 $ 105.03
Restricted Stock Units (RSUs) [Member]    
Outstanding, shares (in shares)   31,000
Outstanding, weighted-average grant date fair value (in dollars per share)   $ 162.23
Awards granted, shares (in shares) 8 28,000
Awards granted, weighted-average grant date fair value (in dollars per share)   $ 213.33
Awards forfeited or expired, shares (in shares)   (2,000)
Awards forfeited or expired, weighted-average grant date fair value (in dollars per share)   $ 160.55
Awards exercised or distributed, shares (in shares)   (5,000)
Awards exercised or distributed, weighted-average grant date fair value (in dollars per share)   $ 168.58
Outstanding, shares (in shares) 52,000 52,000
Outstanding, weighted-average grant date fair value (in dollars per share) $ 189.17 $ 189.17