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Note 6 - Stock-based Compensation - Stock Option and Non-vested Stock Award Activity (Details)
 6 Months Ended
Sep. 30, 2018
$ / shares
shares
Options outstanding (in shares) 458,000
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 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) | $ / shares $ 125.68
Options granted (in shares) 24,940
Options granted, weighted average exercise price (in dollars per share) | $ / shares $ 143.36
Non-vested stock awards granted (in shares) 27,000
Non-vested stock awards granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 168.82
Options forfeited or expired (in shares) (25,000)
Options forfeited or expired, weighted average exercise price (in dollars per share) | $ / shares $ 96.51
Non-vested stock awards forfeited (in shares)
Non-vested stock awards forfeited, weighted average grant date fair value (in dollars per share) | $ / shares $ 142.20
Options exercised (in shares) (52,000)
Options exercised, weighted average exercise price (in dollars per share) | $ / shares $ 68.98
Non-vested stock awards vested (in shares) (2,000)
Non-vested stock awards vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 151.18
Options outstanding (in shares) 406,000
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 91.53
Non-vested stock awards outstanding (in shares) 34,000
Non-vested stock awards outstanding, weighted average grant date fair value (in dollars per share) | $ / shares $ 161.30
Options exercisable (in shares) 157