Note 5 - Property and Equipment - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment, Gross	$ 8,535	$ 8,572
Less: accumulated depreciation	(7,680)	(7,426)
Property and equipment, net	855	1,146
Leasehold Improvements [Member]
Property, Plant and Equipment, Gross	3,779	3,779
Computer Equipment [Member]
Property, Plant and Equipment, Gross	2,095	2,132
Telephone Equipment [Member]
Property, Plant and Equipment, Gross	302	302
Furniture and Fixtures [Member]
Property, Plant and Equipment, Gross	$ 2,359	$ 2,359