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SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2018 USD ($) MW	Dec. 31, 2018 USD ($) facility	Dec. 31, 2018 USD ($) item	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
SEGMENT REPORTING
Number of reportable segments | segment									3
Revenues from external customers													$ 125,380	$ 146,785
Net revenues	$ 27,187	$ 31,445	$ 36,781	$ 29,967	$ 17,768	$ 29,595	$ 43,362	$ 56,060					125,380	146,785
Operating (loss) profit	(12,181)	$ (2,612)	$ (5,736)	$ (4,537)	(6,689)	$ (1,831)	$ (516)	$ 1,603					(25,066)	(7,433)
Depreciation and amortization													9,183	8,999
Capital expenditures													2,324	6,688
Assets held for sale					580									580
Total Assets	99,165				112,350				$ 99,165	$ 99,165	$ 99,165	$ 99,165	99,165	112,350
Eliminations
SEGMENT REPORTING
Intersegment revenues													(130)
Net revenues													(130)
Total Assets	(228,327)				(229,412)				(228,327)	(228,327)	$ (228,327)	$ (228,327)	(228,327)	(229,412)
Towers and Heavy Fabrications
SEGMENT REPORTING
Number of facilities | facility											2
Number of tower sections											1,650	1,650
Revenues from external customers													68,773	103,389
Intersegment revenues													42
Net revenues													68,815
Operating (loss) profit													(4,346)	2,667
Depreciation and amortization													4,986	4,638
Capital expenditures													1,441	5,355
Total Assets	32,866				27,958				32,866	$ 32,866	$ 32,866	$ 32,866	32,866	27,958
Towers and Heavy Fabrications | Minimum
SEGMENT REPORTING
Power generating capacity of turbines that towers produced annually can support (in megawatts) | MW										1,100
Towers and Heavy Fabrications | Maximum
SEGMENT REPORTING
Annual tower production capacity (in towers) | item												550
Gearing
SEGMENT REPORTING
Revenues from external customers													38,376	26,006
Net revenues													38,376
Operating (loss) profit													51	(2,632)
Depreciation and amortization													2,255	2,430
Capital expenditures													706	726
Assets held for sale					560									560
Total Assets	37,028				38,016				37,028	$ 37,028	37,028	$ 37,028	37,028	38,016
Process Systems
SEGMENT REPORTING
Revenues from external customers													18,231	17,390
Intersegment revenues													88
Net revenues													18,319	17,390
Operating (loss) profit													(16,442)	(2,269)
Depreciation and amortization													1,709	1,706
Capital expenditures													31	426
Total Assets	13,731				26,442				13,731	13,731	13,731	13,731	13,731	26,442
Corporate
SEGMENT REPORTING
Operating (loss) profit													(4,329)	(5,199)
Depreciation and amortization													233	225
Capital expenditures													146	181
Assets held for sale					20									20
Total Assets	$ 243,867				$ 249,346				$ 243,867	$ 243,867	$ 243,867	$ 243,867	$ 243,867	$ 249,346

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