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Note 2 - Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenues $ 57,163 $ 44,843 $ 156,879 $ 136,699
Consolidation, Eliminations [Member]        
Revenues (1) (7) (457) (819)
Heavy Fabrications [Member] | Operating Segments [Member]        
Revenues 38,326 30,640 103,864 93,486
Gearing [Member] | Operating Segments [Member]        
Revenues 11,404 10,190 34,347 30,890
Industrial Solutions [Member] | Operating Segments [Member]        
Revenues $ 7,434 $ 4,020 $ 19,125 $ 13,142