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Note 2 - Liquidity and Capital Resources (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Net Income (Loss) Attributable to Parent $ (6,281) $ (4,786)  
Net Cash Provided by (Used in) Operating Activities (7,022) (4,878)  
Cash and Cash Equivalents, at Carrying Value 103,868 $ 131,486 $ 110,890
Working Capital (Deficit) $ 107,925