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Note 15 - Segment Reporting (Details Textual) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Revenue from Contract with Customer, Including Assessed Tax | $ 40,322 | $ 54,614 | $ 54,926 | $ 48,634 | $ 49,253 | $ 46,138 | $ 41,169 | $ 41,660 | $ 198,496 | $ 178,220
Accounts Receivable, after Allowance for Credit Loss, Current, Total | 15,337 |  |  |  | 18,310 |  |  |  | $ 15,337 | $ 18,310
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  |  |  |  |  |  |  | 5 | 5
Customer Concentration Risk [Member] | Five Largest Customers [Member] | Revenue Benchmark [Member] |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 78.00% | 79.00%
Heavy Fabrications [Member] |  |  |  |  |  |  |  |  |  |
Number of Facilities |  |  |  |  |  |  |  |  | 2 |
Number of Tower Sections in Production Capacity of Turbines Total |  |  |  |  |  |  |  |  | 1,650 |
Heavy Fabrications [Member] | One Customer [Member] |  |  |  |  |  |  |  |  |  |
Accounts Receivable, after Allowance for Credit Loss, Current, Total | $ 6,118 |  |  |  | $ 8,428 |  |  |  | $ 6,118 | $ 8,428
Heavy Fabrications [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  |  |  |  |  |  |  | 1 | 1
Heavy Fabrications [Member] | One Customer [Member] |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | $ 105,366 | $ 110,693
Heavy Fabrications [Member] | Two Customers [Member] |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | $ 25,237 |
Heavy Fabrications [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Annual Tower Production Capacity |  |  |  |  |  |  |  |  | 550 |
Heavy Fabrications [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Power Generating Capacity of Turbines |  |  |  |  |  |  |  |  | 1,100 |

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