Note 9 - Stockholders' Equity - RSU and PSU Activity (Details) - RSUs and PSUs [Member]	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Unvested as at the beginning of the year (in shares) | shares	879,277
Unvested as at the beginning of the year (in dollars per share) | $ / shares	$ 37.57
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period | shares	943,377
Granted, weighted average fair value (in dollars per share) | $ / shares	$ 20.51
Vested (in shares) | shares	(363,453)
Vested, weighted average fair value (in dollars per share) | $ / shares	$ 38.71
Forfeited (in shares) | shares	(177,450)
Forfeited or expired, weighted average fair value (in dollars per share) | $ / shares	$ 35.54
Unvested at the end of the year (in shares) | shares	1,281,751
Unvested at the end of the year (in dollars per share) | $ / shares	$ 24.97