Note 14 - Equity Incentive Plan - Performance Stock Units (Details) - Performance Shares [Member] - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Outstanding, shares (in shares)	158,297
Outstanding, weighted average grant date fair value (in dollars per share)	$ 37.44
Granted (in shares)	2,125
Granted, weighted average grant date fair value (in dollars per share)	$ 32.53	$ 0	$ 36.93
Vested, shares (in shares)	(19,125)
Vested, weighted average grant date fair value (in dollars per share)	$ 32.53
Forfeited and cancelled, shares (in shares)	(23,400)
Forfeited and cancelled, weighted average grant date fair value (in dollars per share)	$ 41.86
Outstanding, shares (in shares)	117,897	158,297
Outstanding, weighted average grant date fair value (in dollars per share)	$ 34.98	$ 37.44