Note 17 - Business Combinations - Purchase Price Allocation (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021	Nov. 17, 2021	Oct. 22, 2021	Jul. 28, 2021	Apr. 13, 2021
Goodwill, Ending Balance		$ 7,006	$ 100,899
Front Line Power Construction, LLC [Member]
Cash and cash equivalents				$ 6,779
Trade accounts receivable				15,726
Contract assets				2,092
Prepaid expenses and other current assets				481
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total				18,730
Other long-term assets				531
Indefinite lived intangible assets				15,027
Definite lived intangible assets				93,211
Accounts payable				(620)
Contract liabilities				(120)
Accrued expenses				(2,747)
Net assets acquired				149,090
Goodwill, Ending Balance				70,151
Purchase price allocation				$ 219,241
Full Moon [Member]
Cash and cash equivalents					$ 747
Trade accounts receivable					297
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total					124
Accounts payable					(197)
Net assets acquired					1,158
Goodwill, Ending Balance					826
Purchase price allocation					1,984
Accrued expenses and other liabilities					(182)
Full Moon [Member] | Customer Relationships [Member]
Definite lived intangible assets					210
Full Moon [Member] | Indefinite Trade Names [Member]
Indefinite lived intangible assets					$ 159
IMMCO, Inc. [Member]
Cash and cash equivalents						$ 1,634
Trade accounts receivable						1,254
Contract assets						1,001
Prepaid expenses and other current assets						551
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total						760
Other long-term assets						76
Net assets acquired						7,507
Goodwill, Ending Balance						11,114
Purchase price allocation						18,621
Deferred tax liability	[1]					(2,090)
Liabilities assumed						(2,100)
IMMCO, Inc. [Member] | Customer Relationships [Member]
Definite lived intangible assets						3,800
IMMCO, Inc. [Member] | Technology - Based Asset - Know How [Member]
Definite lived intangible assets						1,459
IMMCO, Inc. [Member] | Indefinite Trade Names [Member]
Indefinite lived intangible assets						$ 1,162
Gibson Technical Services, Inc. [Member]
Cash and cash equivalents							$ 610
Trade accounts receivable							7,871
Contract assets							1,686
Prepaid expenses and other current assets							408
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total							3,795
Other long-term assets							123
Net assets acquired							26,593
Goodwill, Ending Balance							12,339
Purchase price allocation							38,932
Deferred tax liability	[1]						(9,048)
Liabilities assumed							(3,984)
Contingent receivable							1,424
Right of use assets - Operating leases							860
Gibson Technical Services, Inc. [Member] | Customer Relationships [Member]
Definite lived intangible assets							16,075
Gibson Technical Services, Inc. [Member] | Noncompete Agreements [Member]
Definite lived intangible assets							385
Gibson Technical Services, Inc. [Member] | Indefinite Trade Names [Member]
Indefinite lived intangible assets							$ 6,388

[1] The deferred tax liability recorded at acquisition was offset against the Company's valuation allowance and recorded as a tax benefit in 2020.