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Note 13 - Revenues - By Significant Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenue from Contract with Customer, Including Assessed Tax $ 5,788 $ 11,482 $ 19,187 $ 40,855
Customer Concentration Risk [Member]        
Revenue from Contract with Customer, Including Assessed Tax 5,788 11,482 19,187  
UNITED STATES        
Revenue from Contract with Customer, Including Assessed Tax 3,386 7,878 12,007 33,051
SERBIA        
Revenue from Contract with Customer, Including Assessed Tax 1,037 1,626 2,926 5,047
ROMANIA        
Revenue from Contract with Customer, Including Assessed Tax 321 601 1,392 1,140
CROATIA        
Revenue from Contract with Customer, Including Assessed Tax 316 205 1,015 472
MONTENEGRO        
Revenue from Contract with Customer, Including Assessed Tax 244 84 581 446
BOSNIA AND HERZEGOVINA        
Revenue from Contract with Customer, Including Assessed Tax 424 111 714 197
Other [Member]        
Revenue from Contract with Customer, Including Assessed Tax $ 60 $ 977 $ 552 $ 502