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Note 9 - Intangible Assets, Net

3 Months Ended

Mar. 31, 2023

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, 2023*
		*Gross*				*Accumulated*				*Intangible*
		*Amount*				*amortization*				*assets, net*
Patents		$	9,111			$	(5,493	)		$	3,618
Trademarks			60				(23	)			37
Total intangible assets		$	9,171			$	(5,516	)		$	3,655

		*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 March 31, 2023 and 2022, amortization expense for intangible assets, included in general and administrative expenses on the statement of operations, was each $0.2 million. The remaining weighted average amortization period for intangible assets is approximately 5.7 years.

At March 31, 2023, future amortization expense for intangible assets for future one year periods is estimated to be (in thousands):

2023			477
2024			636
2025			636
2026			636
2027			636
2028 and thereafter			634
			3,655