SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) facility item MW	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
SEGMENT REPORTING
Revenues from external customers	$ 54,926	$ 41,169	$ 103,560	$ 82,829
Net revenues	54,926	41,169	103,560	82,829
Operating profit (loss)	1,035	(206)	2,715	(700)
Depreciation and amortization	1,582	1,628	3,194	3,390
Capital expenditures	259	606	929	1,183
Total Assets	138,452		$ 138,452		$ 122,866
Heavy Fabrications
SEGMENT REPORTING
Number of facilities | facility			2
Number of tower sections | item			1,650
Revenues from external customers	43,614	28,970	$ 81,983	57,264
Net revenues	43,614		81,983
Operating profit (loss)	3,199	318	6,740	96
Depreciation and amortization	939	978	1,903	2,073
Capital expenditures	217	308	598	509
Total Assets	58,651		$ 58,651		41,432
Heavy Fabrications | Maximum
SEGMENT REPORTING
Annual tower production capacity (in towers) | item			550
Heavy Fabrications | Minimum
SEGMENT REPORTING
Power generating capacity of turbines that towers produced annually can support (in megawatts) | MW			1,100
Gearing
SEGMENT REPORTING
Revenues from external customers	6,915	9,266	$ 13,142	19,293
Intersegment revenues	7		7
Net revenues	6,922	9,266	13,149	19,293
Operating profit (loss)	(651)	913	(912)	2,300
Depreciation and amortization	503	483	1,015	964
Capital expenditures	1	273	169	640
Total Assets	46,307		46,307		47,022
Industrial Solutions
SEGMENT REPORTING
Revenues from external customers	4,397	2,933	8,435	6,272
Net revenues	4,397	2,933	8,435	6,272
Operating profit (loss)	217	28	410	(256)
Depreciation and amortization	106	122	210	245
Capital expenditures	7	14	127	14
Total Assets	9,295		9,295		8,893
Corporate
SEGMENT REPORTING
Operating profit (loss)	(1,730)	(1,465)	(3,523)	(2,840)
Depreciation and amortization	34	45	66	108
Capital expenditures	34	$ 11	35	$ 20
Total Assets	236,137		236,137		239,629
Eliminations
SEGMENT REPORTING
Intersegment revenues	(7)		(7)
Net revenues	(7)		(7)
Total Assets	$ (211,938)		$ (211,938)		$ (214,110)