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Note 1 - Nature of Operations, Basis of Presentation and Summary of Significant Accounting Policies - Key Financial Metrics (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Assets $ 44,601     $ 67,261     $ 44,601 $ 67,261 $ 61,459
Liabilities 18,080     20,836     18,080 20,836 $ 20,171
Revenue from Contract with Customer, Including Assessed Tax 5,788     11,482     19,187 40,855  
Net Income (Loss) Attributable to Parent (4,870) $ (4,278) $ (15,523) 1,297 $ (4,916) $ (3,037) (24,671) (6,656)  
SERBIA                  
Revenue from Contract with Customer, Including Assessed Tax 1,037     1,626     2,926 5,047  
SERBIA | Geographic Distribution, Foreign [Member]                  
Assets 19,643     27,662     19,643 27,662  
Liabilities 11,465     11,944     11,465 11,944  
Revenue from Contract with Customer, Including Assessed Tax 2,402     3,604     7,180 7,804  
Net Income (Loss) Attributable to Parent (1,195)     (391)     (7,195) (1,189)  
UNITED STATES                  
Revenue from Contract with Customer, Including Assessed Tax 3,386     7,878     12,007 33,051  
UNITED STATES | Geographic Distribution, Domestic [Member]                  
Assets 24,647     39,599     24,647 39,599  
Liabilities 6,615     8,892     6,615 8,892  
Revenue from Contract with Customer, Including Assessed Tax 3,386     7,878     12,007 33,051  
Net Income (Loss) Attributable to Parent (3,648)     1,688     (17,449) (5,467)  
UNITED ARAB EMIRATES | Geographic Distribution, Foreign [Member]                  
Assets 311     0     311 0  
Liabilities 0     0     0 0  
Revenue from Contract with Customer, Including Assessed Tax 0     0     0 0  
Net Income (Loss) Attributable to Parent $ (27)     $ 0     $ (27) $ 0