Note 11 - Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Marketable Securities [Table Text Block]

	September 30, 2021						December 31, 2020
			Unrealized		Fair				Unrealized		Fair
	Cost		Gains (Losses)		Value		Cost		Gains (Losses)		Value
Certificates of deposit	$	18	$	—	$	18	$	21	$	—	$	21
Corporate securities		—		—		—		—		—		—
Total current marketable securities	$	18	$	—	$	18	$	21	$	—	$	21
Noncurrent marketable securities - Corporate securities	$	—	$	—	$	—	$	16	$	33	$	49