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Note 2 - Revenues (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Revenue from Contract with Customer, Including Assessed Tax $ 44,843 $ 40,389 $ 136,699 $ 119,608
Transferred over Time [Member] | Gearing [Member]        
Revenue from Contract with Customer, Including Assessed Tax   499   2,444
Transferred over Time [Member] | Heavy Fabrications [Member]        
Revenue from Contract with Customer, Including Assessed Tax $ 5,927 $ 1,791 $ 13,336 $ 4,220