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Note 15 - Segment Reporting (Details Textual) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) MWh | Dec. 31, 2021 USD ($) MWh
Revenue from Contract with Customer, Including Assessed Tax | $ 40,060,000 | $ 44,843,000 | $ 50,012,000 | $ 41,844,000 | $ 26,011,000 | $ 40,389,000 | $ 46,491,000 | $ 32,728,000 | $ 176,759,000 | $ 145,619,000
Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  |  |  |  |  |  |  | 5 | 5
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  |  |  |  |  |  |  | 5 | 5
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Five Largest Customers [Member] |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 69.00% | 71.00%
Heavy Fabrications [Member] |  |  |  |  |  |  |  |  |  |
Number of Facilities |  |  |  |  |  |  |  |  | 2 | 2
Number of Tower Sections in Production Capacity of Turbines Total |  |  |  |  |  |  |  |  | 1,650 | 1,650
Heavy Fabrications [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  |  |  |  |  |  |  | 2 |
Heavy Fabrications [Member] | Customer One [Member] |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | $ 64,625,000 | $ 59,278
Heavy Fabrications [Member] | Customer Two [Member] |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | $ 20,336,000 | $ 25,946
Heavy Fabrications [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Annual Tower Production Capacity |  |  |  |  |  |  |  |  | 550 | 550
Heavy Fabrications [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Power Generating Capacity of Turbines (Megawatt-Hour) | MWh |  |  |  |  |  |  |  |  | 1,100 | 1,100

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