Note 5 - Stockholders' Equity - Summary of RSU Transactions (Details) - Restricted Stock Units (RSUs) [Member]	3 Months Ended
	Mar. 31, 2024 $ / shares shares
Outstanding, shares (in shares) | shares	333,716
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 61.01
Granted, shares (in shares) | shares	105,370
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 62.6
Released, shares (in shares) | shares	(72,900)
Released, weighted average grant date fair value (in dollars per share) | $ / shares	$ 56.05
Forfeited, shares (in shares) | shares	(8,184)
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	$ 52.15
Non-vested, shares (in shares) | shares	358,002
Non-vested outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 62.69