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Note 2 - Revenues (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenue from Contract with Customer, Including Assessed Tax $ 57,163 $ 44,843 $ 156,879 $ 136,699
Heavy Fabrications [Member] | Transferred over Time [Member]        
Revenue from Contract with Customer, Including Assessed Tax $ 1,424 $ 5,927 $ 5,285 $ 13,336