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Note 6 - Intangible Assets, Net - Carrying Value of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Cost	$ 30,443	$ 30,443
Amortization of intangible assets	(25,644)	(23,938)
Net Book Value	4,799	6,505
Intangible assets, net	4,839	6,545
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 6 months	4 years 6 months
Weighted Average Remaining Life (Year)	8 months 12 days	10 months 24 days
Cost	$ 28,556	$ 28,556
Amortization of intangible assets	(24,081)	(22,463)
Net Book Value	$ 4,475	$ 6,093
Patents [Member]
Weighted Average Life (Year)	14 years	14 years
Weighted Average Remaining Life (Year)	2 years 4 months 24 days	2 years 8 months 12 days
Cost	$ 1,387	$ 1,387
Amortization of intangible assets	(1,146)	(1,121)
Net Book Value	$ 241	$ 266
Noncompete Agreements [Member]
Weighted Average Life (Year)	2 years	2 years
Weighted Average Remaining Life (Year)	3 months 18 days	7 months 6 days
Cost	$ 500	$ 500
Amortization of intangible assets	(417)	(354)
Net Book Value	$ 83	$ 146

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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