Note 1 - Nature of Business, Financial Condition and Basis of Presentation - Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2021	Dec. 31, 2020
Gross Carrying Amount	$ 9,300
Patents	(202)
Identifiable Intangible Assets, Net	$ 9,098	$ 114
Weighted-Average Useful Life (Year)	7 years 10 months 24 days
Patents [Member]
Gross Carrying Amount	$ 4,496	300
Patents	(202)	(186)
Identifiable Intangible Assets, Net	$ 4,294	$ 114
Weighted-Average Useful Life (Year)	7 years 3 months 18 days	5 years 2 months 12 days
Defensive Assets [Member]
Gross Carrying Amount	$ 4,804
Patents	0
Identifiable Intangible Assets, Net	$ 4,804
Weighted-Average Useful Life (Year)	8 years 4 months 24 days

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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