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Note 9 - Intangible Assets, Net (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

Schedule of Finite-Lived Intangible Assets [Table Text Block]

		March 31, 2022
​		Gross				Accumulated				Intangible
​		Amount				amortization				assets, net
Patents		$	8,683			$	(4,910	)		$	3,773
Trademarks			37				(18	)			19
Total intangible assets		$	8,720			$	(4,928	)		$	3,792

		December 31, 2021
​		Gross				Accumulated				Intangible
​		Amount				amortization				assets, net
Patents		$	8,597			$	(4,779	)		$	3,818
Trademarks			35				(17	)			18
Total intangible assets		$	8,632			$	(4,796	)		$	3,836

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

2023		$	584
2024			584
2025			584
2026			584
2027			584
thereafter			872
		$	3,792

X

- Definition

Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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- Definition

Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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