Note 13 - Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Marketable Securities [Table Text Block]

	2020						2019
			Unrealized		Fair				Unrealized		Fair
	Cost		Gains (Losses)		Value		Cost		Gains (Losses)		Value
Certificates of deposit - Current marketable securities	$	21	$	—	$	21	$	19	$	—	$	19
Corporate securities - Noncurrent marketable securities	$	16	$	33	$	49	$	—	$	—	$	—