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Note I - Intangible Assets

12 Months Ended

Dec. 31, 2021

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, 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

		*December 31, 2020*
		*Gross*				*Accumulated*				*Intangible*
		*Amount*				*amortization*				*assets, net*
Patents		$	8,158			$	(4,165	)		$	3,993
Trademarks			21				(15	)			6
Total intangible assets		$	8,179			$	(4,180	)		$	3,999

For the years ended December 31, 2021, 2020 and 2019, amortization expense for intangible assets, included in general and administrative expenses on the income statement, was $0.5 million each year. The remaining weighted average amortization period for intangible assets is approximately six years.

At December 31, 2021, future amortization expense for intangible assets is estimated to be (in thousands):

2022		$	584
2023			584
2024			584
2025			584
2026			584
thereafter			916
		$	3,836