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Note 9 - Intangible Assets, Net

6 Months Ended

Jun. 30, 2022

Intangible Assets Disclosure [Text Block]

Note 9. Intangible Assets, net

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

	*June 30, 2022*
	*Gross*		*Accumulated*			*Intangible*
	*Amount*		*amortization*			*assets, net*
Patents	$	8,781	$	(5,041	)	$	3,740
Trademarks		42		(19	)		23
Total intangible assets	$	8,823	$	(5,060	)	$	3,763

	*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

For the three months ended June 30, 2022 and 2021, amortization expense for intangible assets, included in general and administrative expenses on the income statement, was each $0.2 million. For the six months ended June 30, 2022 and 2021, the amortization expense for intangible assets, was each $0.3 million. The remaining weighted average amortization period for intangible assets is approximately 6 years.

At June 30, 2022, future amortization expense for intangible assets for future one year periods is estimated to be (in thousands):

2023	$	611
2024		611
2025		611
2026		611
2027		611
2028		611
thereafter		97
	$	3,763