Note 6 - Property and Equipment, Net - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Property, Plant and Equipment, Gross	$ 8,556	$ 8,535
Less: accumulated depreciation	(7,876)	(7,680)
Property and equipment, net	680	855
Leasehold Improvements [Member]
Property, Plant and Equipment, Gross	3,779	3,779
Computer Equipment [Member]
Property, Plant and Equipment, Gross	2,116	2,095
Telephone Equipment [Member]
Property, Plant and Equipment, Gross	302	302
Furniture and Fixtures [Member]
Property, Plant and Equipment, Gross	$ 2,359	$ 2,359