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Note 15 - Segment Reporting (Details Textual) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) MWh	Dec. 31, 2020 USD ($)
Revenue from Contract with Customer, Including Assessed Tax	$ 26,011	$ 40,389	$ 46,491	$ 32,728	$ 40,322	$ 54,614	$ 54,926	$ 48,634	$ 145,619	$ 198,496
Accounts Receivable, after Allowance for Credit Loss, Current, Total	$ 13,802				15,337				$ 13,802	$ 15,337
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] \| Five Largest Customers [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage									71.00%	78.00%
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					$ 6,118
Heavy Fabrications [Member] \| Customer Concentration Risk [Member]
Number of Major Customers									2	1
Heavy Fabrications [Member] \| Customer One [Member]
Revenue from Contract with Customer, Including Assessed Tax									$ 59,278
Heavy Fabrications [Member] \| Customer Two [Member]
Revenue from Contract with Customer, Including Assessed Tax									$ 25,946
Heavy Fabrications [Member] \| One Customer [Member]
Revenue from Contract with Customer, Including Assessed Tax										$ 105,366
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 (Megawatt-Hour) \| MWh									1,100