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Note 9 - Intangible Assets, Net

9 Months Ended

Sep. 30, 2020

Intangible Assets Disclosure [Text Block]

Note 9. Intangible Assets, net

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

	*September 30, 2020*
	*Gross*		*Accumulated*			*Intangible*
	*Amount*		*amortization*			*assets, net*
Patents	$	8,029	$	(4,005	)	$	4,024
Trademarks		22		(15	)		7
Total intangible assets	$	8,051	$	(4,020	)	$	4,031

	*December 31, 2019*
	*Gross*		*Accumulated*			*Intangible*
	*Amount*		*amortization*			*assets, net*
Patents	$	7,638	$	(3,560	)	$	4,078
Trademarks		17		(14	)		3
Total intangible assets	$	7,655	$	(3,574	)	$	4,081

For the three months ended September 30, 2020 and 2019, 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, 2020 and 2019, amortization expense for intangible assets, included in general and administrative expenses on the income statement, was each $0.4 million. The remaining weighted average amortization period for intangible assets is approximately 7 years.

At September 30, 2020, future amortization expense for intangible assets is estimated to be (in thousands):

2021	$	570
2022		570
2023		570
2024		570
2025		570
thereafter		1,181
	$	4,031