SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) facility item MW	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
SEGMENT REPORTING
Revenues from external customers		$ 41,660
Revenues	$ 48,634	41,660
Operating profit (loss)	1,680	(494)
Depreciation and amortization	1,612	1,761
Capital expenditures	670	577
Total Assets	$ 134,298		$ 122,866
Towers and Heavy Fabrications
SEGMENT REPORTING
Number of facilities | facility	2
Number of tower sections | item	1,650
Revenues from external customers		28,294
Revenues	$ 38,368
Operating profit (loss)	3,541	(222)
Depreciation and amortization	963	1,095
Capital expenditures	381	201
Total Assets	$ 52,904		41,432
Towers and Heavy Fabrications | Maximum
SEGMENT REPORTING
Annual tower production capacity (in towers) | item	550
Towers and 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		10,027
Revenues	$ 6,227	10,027
Operating profit (loss)	(261)	1,387
Depreciation and amortization	512	482
Capital expenditures	168	367
Total Assets	46,802		47,022
Industrial Solutions
SEGMENT REPORTING
Revenues from external customers		3,339
Revenues	4,039	3,339
Operating profit (loss)	192	(285)
Depreciation and amortization	104	122
Capital expenditures	120
Total Assets	9,107		8,893
Corporate
SEGMENT REPORTING
Operating profit (loss)	(1,792)	(1,374)
Depreciation and amortization	33	62
Capital expenditures	1	$ 9
Total Assets	239,429		239,629
Eliminations
SEGMENT REPORTING
Total Assets	$ (213,944)		$ (214,110)