Note 10 - Income Taxes - Reconciliation of Amounts of US Federal Statutory Income Tax Rate to Effective Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
U.S. federal statutory tax rate	$ (3,909)	$ (7,067)	$ (6,886)
State and local income taxes, net	(2,077)	(292)	(962)
Stock-based compensation	3,117	(51)	10,865
Executive compensation limitation	449	3,566	0
Fair value of earnout liability	2,165	(828)	(3,946)
GILTI inclusion, net	1,940	0	0
Foreign-derived intangible income deduction	(1,534)	0	0
Transaction costs	0	125	(2,209)
Change in valuation allowance	1,794	12,844	3,085
Deferred rate change	2,076	0	0
Foreign rate differential	(1,107)	(2,066)	440
Return-to-provision adjustments	274	(1,029)	(196)
Permanent differences	(343)	29	334
Other, net	42	(193)	(68)
Total	$ 2,887	$ 5,038	$ 457