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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 01, 2021 | Jun. 01, 2021 | Oct. 07, 2020 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  |  |  | $ 465,926 | $ 22,815 |
Goodwill, Ending Balance |  |  |  |  | 1,174,315 |  | $ 855,228
Business Combination, Contingent Consideration, Liability, Total |  |  |  |  | 70,206 |  | $ 5,888
Acquisition of Deep Sea [Member] |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  | $ 420,700 |  |  |  |  |
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill |  | 434,724 |  |  |  |  |
Goodwill, Ending Balance |  | $ 263,287 |  |  | $ 263,287 |  |
Acquisition of Off Grid Energy [Member] |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total | $ 76,553 |  |  |  |  |  |
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill | 71,935 |  |  |  |  |  |
Goodwill, Ending Balance | 48,263 |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Total | 44,042 |  |  |  |  |  |
Other 2021 Acquisitions [Member] |  |  |  |  |  |  |
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill | 69,776 |  |  |  |  |  |
Goodwill, Ending Balance | $ 30,976 |  |  |  |  |  |
Acquisition of Enbala [Member] |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  | $ 41,982 |  |  |  |
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill |  |  | 46,338 |  |  |  |
Goodwill, Ending Balance |  |  | $ 27,038 |  |  |  |
Other 2020 Acquisitions [Member] |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  |  | $ 22,958 |  |  |

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