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Note 7 - Stock-based Compensation - Stock Option and Non-vested Stock Award Activity (Details) - $ / shares
 9 Months Ended
Dec. 31, 2018
Options outstanding (in shares) 458,000
Options outstanding, weighted average exercise price (in dollars per share) $ 86.38
Non-vested stock awards outstanding (in shares) 9,000
Non-vested stock awards outstanding, weighted average grant date fair value (in dollars per share) $ 125.68
Options granted (in shares) 25,544
Options granted, weighted average exercise price (in dollars per share) $ 144.65
Non-vested stock awards granted (in shares) 29,000
Non-vested stock awards granted, weighted average grant date fair value (in dollars per share) $ 169.94
Options forfeited or expired (in shares) (36,000)
Options forfeited or expired, weighted average exercise price (in dollars per share) $ 98.91
Non-vested stock awards forfeited (in shares) (3,000)
Non-vested stock awards forfeited, weighted average grant date fair value (in dollars per share) $ 171.51
Options exercised (in shares) (58,000)
Options exercised, weighted average exercise price (in dollars per share) $ 69.75
Non-vested stock awards vested (in shares) (2,000)
Non-vested stock awards vested, weighted average grant date fair value (in dollars per share) $ 163.47
Options outstanding (in shares) 390,000
Options outstanding, weighted average exercise price (in dollars per share) $ 91.58
Non-vested stock awards outstanding (in shares) 33,000
Non-vested stock awards outstanding, weighted average grant date fair value (in dollars per share) $ 128.04
Options exercisable (in shares) 151,000