Note 6 - Intangible Assets, Net - Carrying Value of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Cost	$ 42,387	$ 42,387
Amortization of intangible assets	(30,398)	(29,626)
Net Book Value	11,990	12,761
Total intangible assets, net	12,030	12,801
Intangible Assets Not Subject to Amortization [Member]
Intangible assets not subject to amortization	$ 40	$ 40
Developed Technology Rights [Member]
Weighted Average Life (Year)	4 years 7 months 6 days	4 years 7 months 6 days
Weighted Average Remaining Life (Year)	1 year 3 months 18 days	1 year 4 months 24 days
Cost	$ 40,141	$ 40,141
Amortization of intangible assets	(28,561)	(27,860)
Net Book Value	$ 11,580	$ 12,281
Patents [Member]
Weighted Average Life (Year)	14 years	14 years
Weighted Average Remaining Life (Year)	1 year 4 months 24 days	1 year 8 months 12 days
Cost	$ 1,387	$ 1,387
Amortization of intangible assets	(1,246)	(1,221)
Net Book Value	$ 141	$ 166
Noncompete Agreements [Member]
Weighted Average Life (Year)	2 years	2 years
Cost	$ 500	$ 500
Amortization of intangible assets	(500)	(500)
Net Book Value	$ 0	$ 0
Assembled Workforce [Member]
Weighted Average Life (Year)	2 years	2 years
Weighted Average Remaining Life (Year)	1 year 6 months	1 year 8 months 12 days
Cost	$ 359	$ 359
Amortization of intangible assets	(90)	(45)
Net Book Value	$ 269	$ 314