Note 5 - Stockholders' Equity - Summary of PSU Transactions (Details) - Performance Shares [Member]	3 Months Ended
	Mar. 31, 2024 $ / shares shares
Outstanding, shares (in shares) | shares	423,621
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 38.9
Granted, shares (in shares) | shares	55,005
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 65.22
Released, shares (in shares) | shares	(12,645)
Released, weighted average grant date fair value (in dollars per share) | $ / shares	$ 96.74
Forfeited, shares (in shares) | shares	(4,944)
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	$ 50.19
Non-vested, shares (in shares) | shares	461,037
Non-vested outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 40.33