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Note 2 - Revenues (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Revenue from Contract with Customer, Including Assessed Tax $ 50,012 $ 46,491 $ 91,856 $ 79,219
Transferred over Time [Member] | Gearing [Member]        
Revenue from Contract with Customer, Including Assessed Tax   975   1,532
Transferred over Time [Member] | Heavy Fabrications [Member]        
Revenue from Contract with Customer, Including Assessed Tax $ 4,182 $ 1,276 $ 7,409 $ 2,429