Note 4 - Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

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

	March 31, 2021			December 31, 2020
Customer relationships	$	626		$	626
Patents and trademarks		441			441
Total intangible assets		1,067			1,067
Accumulated amortization		(504	)		(450	)
Net carrying value	$	563		$	617

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

	2022		2023		2024		2025		2026
Customer relationships	$	125	$	125	$	73	$	-	$	-
Patents and trademarks		93		93		54		-		-
Total intangible asset amortization expense	$	218	$	218	$	127	$	-	$	-