Note I - Intangible Assets, Net

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Intangible Assets Disclosure [Text Block]

NOTE I—INTANGIBLE ASSETS

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

	December 31, 2023
	Gross		Accumulated			Intangible
	Amount		amortization			assets, net
Patents	$	9,502	$	(5,981	)	$	3,521
Trademarks		138		(31	)	$	107
Total intangible assets	$	9,640	$	(6,012	)	$	3,628

	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 years ended December 31, 2023, 2022 and 2021, amortization expense for intangible assets, included in general and administrative expenses on the income statement, was $0.7 million, $0.6 million and $0.5 million, respectively. The remaining weighted average amortization period for intangible assets is approximately six years.

At December 31, 2023, future amortization expense for intangible assets is estimated to be (in thousands):

	December 31, 2023
2024	$	683
2025		683
2026		683
2027		683
2028		683
2029		213
thereafter		-
Total	$	3,628