Note 3 - Cash and Investments (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

	December 31,
	2020		2019
Cash	$	6,509	$	4,092
Cash equivalents (see detail in Note 4)		6,114		3,620
Restricted cash		337		600
Total cash, cash equivalents and restricted cash as presented in the statement of cash flows		12,960		8,312
Short-term investments (see detail in Note 4)		-		2,249
Total cash, cash equivalents, restricted cash and short-term investments	$	12,960	$	10,561