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Note 2 - Revenues (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Revenue from Contract with Customer, Including Assessed Tax $ 50,843 $ 50,012 $ 99,716 $ 91,856
Heavy Fabrications [Member] | Transferred over Time [Member]        
Revenue from Contract with Customer, Including Assessed Tax $ 2,003 $ 4,182 $ 3,861 $ 7,409