Note 3 - Revenue - Components of Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Trade receivables	$ 3,295	$ 4,605
Unbilled receivables	3,444	3,082
Other short-term receivables	126	152
Allowance for credit losses	(110)	(110)	$ (223)
Total accounts receivable	$ 6,755	$ 7,729