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Note 9 - Intangible Assets, Net

6 Months Ended

Jun. 30, 2023

Intangible Assets Disclosure [Text Block]

Note 9. Intangible Assets, net

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

	*June 30, 2023*
	*Gross*		*Accumulated*			*Intangible*
	*Amount*		*amortization*			*assets, net*
Patents	$	9,216	$	(5,640	)	$	3,576
Trademarks		74		(25	)		49
Total intangible assets	$	9,290	$	(5,665	)	$	3,625

	*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 June 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 six months ended June 30, 2023 and 2022, amortization expense for intangible assets, included in general and administrative expenses on the statement of operations, was each $0.3 million. The remaining weighted average amortization period for intangible assets is approximately 5.6 years.

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

2024	$	646
2025		649
2026		649
2027		649
2028		649
2029 and thereafter		383
	$	3,625