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Note 15 - Segment Reporting (Details Textual)	3 Months Ended								12 Months Ended
Note 15 - Segment Reporting (Details Textual)	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) MWh	Dec. 31, 2021 USD ($) MWh
Revenue from Contract with Customer, Including Assessed Tax	$ 40,060,000	$ 44,843,000	$ 50,012,000	$ 41,844,000	$ 26,011,000	$ 40,389,000	$ 46,491,000	$ 32,728,000	$ 176,759,000	$ 145,619,000
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] \| Revenue Benchmark [Member] \| Five Largest Customers [Member]
Concentration Risk, Percentage									69.00%	71.00%
Heavy Fabrications [Member]
Number of Facilities									2	2
Number of Tower Sections in Production Capacity of Turbines Total									1,650	1,650
Heavy Fabrications [Member] \| Customer Concentration Risk [Member]
Number of Major Customers									2
Heavy Fabrications [Member] \| Customer One [Member]
Revenue from Contract with Customer, Including Assessed Tax									$ 64,625,000	$ 59,278
Heavy Fabrications [Member] \| Customer Two [Member]
Revenue from Contract with Customer, Including Assessed Tax									$ 20,336,000	$ 25,946
Heavy Fabrications [Member] \| Maximum [Member]
Annual Tower Production Capacity									550	550
Heavy Fabrications [Member] \| Minimum [Member]
Power Generating Capacity of Turbines (Megawatt-Hour) \| MWh									1,100	1,100