Note 13 - Equity Incentive Plan - Performance Stock Units (Details) - Performance Shares [Member]	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Outstanding, shares (in shares)	117,897
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 3,498
Granted (in shares)	0
Vested, shares (in shares)	0
Forfeited and cancelled, shares (in shares)	(117,897)
Forfeited and cancelled, weighted average grant date fair value (in dollars per share) | $ / shares	$ 34.98
Outstanding, shares (in shares)	0
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 0