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Note 9 - Intangible Assets, Net

9 Months Ended

Sep. 30, 2021

Intangible Assets Disclosure [Text Block]

Note 9. Intangible Assets, net

Intangible assets consisted of the following for the periods indicated (in thousands):

	*September 30, 2021*
	*Gross*		*Accumulated*			*Intangible*
	*Amount*		*amortization*			*assets, net*
Patents	$	8,494	$	(4,626	)	$	3,868
Trademarks		25		(16	)		9
Total intangible assets	$	8,519	$	(4,642	)	$	3,877

	*December 31, 2020*
	*Gross*		*Accumulated*			*Intangible*
	*Amount*		*amortization*			*assets, net*
Patents	$	8,158	$	(4,165	)	$	3,993
Trademarks		21		(15	)		6
Total intangible assets	$	8,179	$	(4,180	)	$	3,999

For the three months ended September 30, 2021 and 2020, amortization expense for intangible assets, included in general and administrative expenses on the income statement, was each $0.1 million. For the nine months ended September 30, 2021 and 2020, amortization expense for intangible assets, included in general and administrative expenses on the income statement, was $0.5 million and $0.4 million, respectively. The remaining weighted average amortization period for intangible assets is approximately 7 years.

At September 30, 2021, future amortization expense for intangible assets is estimated to be (in thousands):

2022	$	584
2023		584
2024		584
2025		584
2026		584
thereafter		957
	$	3,877