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