Note 3 - Accounts Receivable, Net - Schedule of Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Balance	$ (1,000)
Provision for credit loss expense	0	$ 1,000	$ 0
Accounts receivable written-off	0
Recoveries	1,000
Balance	$ (0)	$ 1,000