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Note 4 - Stock-based Compensation - Changes in Retention Awards (Details) - Retention Awards [Member]
shares in Thousands
 9 Months Ended
Sep. 30, 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 238
Granted, weighted-average grant-date fair value (in dollars per share) | $ / shares $ 243.92
Vested (in shares) | shares (408)
Vested, weighted-average grant-date fair value (in dollars per share) | $ / shares $ 126.06
Forfeited (in shares) | shares (50)
Forfeited, weighted-average grant-date fair value (in dollars per share) | $ / shares $ 191.59
Nonvested, ending balance (in shares) | shares 1,067
Nonvested, weighted-average grant-date fair value, ending balance (in dollars per share) | $ / shares $ 196.37