Note 11 - Equity Incentive Plan - Performance Stock Units (Details) - Performance Shares [Member]	6 Months Ended
	Jun. 30, 2023 $ / shares shares
Outstanding, shares (in shares) | shares	117,897
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 34.98
Forfeited and cancelled, shares (in shares) | shares	(117,897)
Forfeited and cancelled, weighted average grant date fair value (in dollars per share) | $ / shares	$ 34.98
Outstanding, shares (in shares) | shares	0
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 0