Note 12 - Accrued Liabilities - Components of Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Contract liabilities (Note 3)	$ 761	$ 1,279	$ 372
Warranty reserve (Note 13)	159	159
Deferred revenue	100	103
Accrued professional fees	0	101
Other accrued liabilities	264	292
Total other accrued liabilities	$ 1,284	$ 1,934