Note 13 - Share-based Compensation - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member]	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Outstanding at December 31, 2021 (in shares) | shares	102,048
Outstanding at December 31, 2021 (in dollars per share) | $ / shares	$ 56.02
Awarded (in shares) | shares	46,050
Awarded (in dollars per share) | $ / shares	$ 113.91
Shares vested (in shares) | shares	(52,126)
Shares vested (in dollars per share) | $ / shares	$ 55.17
Forfeitures (in shares) | shares	(279)
Forfeitures (in dollars per share) | $ / shares	$ 106.6
Outstanding at December 31, 2022 (in shares) | shares	95,693
Outstanding at December 31, 2022 (in dollars per share) | $ / shares	$ 64.82