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Note 9 - Intangible Assets, Net

3 Months Ended

Mar. 31, 2022

Notes to Financial Statements

Intangible Assets Disclosure [Text Block]

Note 9. Intangible Assets, net

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

		*March 31, 2022*
		*Gross*				*Accumulated*				*Intangible*
		*Amount*				*amortization*				*assets, net*
Patents		$	8,683			$	(4,910	)		$	3,773
Trademarks			37				(18	)			19
Total intangible assets		$	8,720			$	(4,928	)		$	3,792

		*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 March 31, 2022 and 2021, amortization expense for intangible assets, included in general and administrative expenses on the income statement, was each $0.1 million. The remaining weighted average amortization period for intangible assets is approximately 6 years.

At March 31, 2022, future amortization expense for intangible assets is estimated to be (in thousands):

2023		$	584
2024			584
2025			584
2026			584
2027			584
thereafter			872
		$	3,792