Note 4 - Revenue - Summary of Receivables, Contract Assets and Contract Liabilities from Contracts with Customers (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Receivables, which are included in ‘Trade accounts receivable’	$ 6,515	$ 6,392	$ 5,769
Current contract assets, which are included in “Prepaid and other assets”	4	0	748
Non-current contract assets, which are included in “other assets”	290	157	15
Contract liabilities, which are included in “Deferred revenue”	$ 5,016	$ 4,374	$ 4,046