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Note 4 - Stock-based Compensation - Changes in Retention Awards (Details) - Retention Awards [Member]
shares in Thousands
3 Months Ended
Mar. 31, 2022
$ / shares
shares
Nonvested, beginning balance (in shares) | shares 1,287
Nonvested, weighted-average grant-date fair value, beginning balance (in dollars per share) | $ / shares $ 165.10
Granted (in shares) | shares 232
Granted, weighted-average grant-date fair value (in dollars per share) | $ / shares $ 244.40
Vested (in shares) | shares (402)
Vested, weighted-average grant-date fair value (in dollars per share) | $ / shares $ 125.26
Forfeited (in shares) | shares (18)
Forfeited, weighted-average grant-date fair value (in dollars per share) | $ / shares $ 187.57
Nonvested, ending balance (in shares) | shares 1,099
Nonvested, weighted-average grant-date fair value, ending balance (in dollars per share) | $ / shares $ 196.05