Note 6 - Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Operating lease cost	$ 1,784	$ 1,051	$ 4,291	$ 3,098
Short-term lease cost	0	22	0	47
Variable lease cost	212	153	597	452
Sublease income	(5)	(5)	(21)	(34)
Net lease cost	$ 1,991	$ 1,221	$ 4,867	$ 3,563