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Note 2 - Revenues (Details Textual) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Revenue from Contract with Customer, Including Assessed Tax | $ 32,728 | $ 48,634
Transferred over Time [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax |  | $ 0
Contract with Customer, Asset, after Allowance for Credit Loss, Total | 269 |
Transferred over Time [Member] | Gearing [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 172 |
Transferred over Time [Member] | Heavy Fabrications [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 1,153 |

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