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Note 9 - Intangible Assets, Net

9 Months Ended

Sep. 30, 2023

Intangible Assets Disclosure [Text Block]

Note 9. Intangible Assets, net

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

	*September 30, 2023*
	*Gross*		*Accumulated*			*Intangible*
	*Amount*		*amortization*			*assets, net*
Patents	$	9,363	$	(5,805	)	$	3,558
Trademarks		95		(27	)		68
Total intangible assets	$	9,458	$	(5,832	)	$	3,626

	*December 31, 2022*
	*Gross*		*Accumulated*			*Intangible*
	*Amount*		*amortization*			*assets, net*
Patents	$	8,994	$	(5,330	)	$	3,664
Trademarks		56		(21	)		35
Total intangible assets	$	9,050	$	(5,351	)	$	3,699

For the three months ended September 30, 2023 and 2022, amortization expense for intangible assets, included in general and administrative expenses on the statement of operations, was each $0.2 million. For the nine months ended September 30, 2023 and 2022, amortization expense for intangible assets, included in general and administrative expenses on the statement of operations, was each $0.5 million. The remaining weighted average amortization period for intangible assets is approximately 5.4 years.

At September 30, 2023, future amortization expense for intangible assets for future one year periods is estimated to be (in thousands):

2024	$	668
2025		668
2026		668
2027		668
2028		668
2029 and thereafter		286
	$	3,626