Note 7 - Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

	December 31, 2021
	Gross Carrying Amount		Accumulated Amortization			Net		Weighted Average Life (Years)
Finite-lived intangible assets:
Patents	$	4,575	$	(368	)	$	4,207		7.3
Defensive assets		4,895		(164	)		4,731		8.4
Identifiable tangible assets	$	9,470	$	(532	)	$	8,938		7.9
	December 31, 2020
	Gross Carrying Amount		Accumulated Amortization			Net		Weighted Average Life (Years)
Finite-lived intangible assets:
Patents	$	300	$	(186	)	$	114		5.2

Finite-lived Intangible Assets Amortization Expense [Table Text Block]

	Years Ended December 31,
	2021		2020		2019
Related to cost of goods sold	$	21	$	21	$	165
Related to research and development expense		161		—		—
Related to selling, general and administrative expense		164		—		—
Total	$	346	$	21	$	165

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

Year Ending December 31,	Patents		Defensive Assets		Total
2022	$	599	$	585	$	1,184
2023		599		585		1,184
2024		600		587		1,187
2025		599		585		1,184
2026		585		585		1,170
Thereafter		1,225		1,804		3,029
Total	$	4,207	$	4,731	$	8,938