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Note 10 - Segment Reporting - Revenue by Geography (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Total revenues $ 700 $ 1,418 $ 0
North America [Member]      
Total revenues 517 1,182 0
Rest of World [Member]      
Total revenues $ 183 $ 236 $ 0