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Note I - Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Schedule of Finite-Lived Intangible Assets [Table Text Block]

		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

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

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

X

- Definition

Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment.

+ References

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- Definition

Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets.

+ References

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