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Note 5 - Revenue from Contracts with Customers - Disaggregation of Revenue 1 (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenue $ 1,196 $ 2,158 $ 4,380 $ 4,546 $ 6,012 $ 4,247 $ 0
Asia Pacific [Member]              
Revenue [2] 82 [1] 232 [1] 351 [1] 1,946 [1] 1,531 3,988  
Europe [Member]              
Revenue [1],[2] 513 43 1,506 80      
North America [Member]              
Revenue [2] 588 [1] 1,817 [1] 2,467 [1] 2,435 [1] 3,438 201  
South America [Member]              
Revenue [1],[2] 13 66 56 85      
Transferred over Time [Member]              
Revenue 413 0 1,236 1,524 1,600 3,800  
Transferred at Point in Time [Member]              
Revenue $ 783 $ 2,158 $ 3,144 $ 3,022 $ 4,400 $ 400  
[1] Certain comparative figures have been reclassified to conform to the current year presentation.
[2] Revenue by geography is based on the geographical location of the customer.