Note 2 - Summary of Significant Accounting Policies - Accounts Receivable, Allowance for Credit Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Beginning balance	$ 6	$ 19
Provision	70	2
Recoveries/write-offs	(3)	(15)
Ending balance	$ 73	$ 6