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COMMITMENTS AND CONTINGENCIES - Tax Credit Program and Worker's Compensation Reserves (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Jul. 20, 2011
New Markets Tax Credit program
Extinguishment gain		$ 2,249
Workers' Compensation Reserves
Amount accrued for self-insured workers' compensation claims		374	$ 812
New Markets Tax Credit Transaction
New Markets Tax Credit program
Future tax credit that can be generated	$ 3,900	$ 3,900
Tax credit period		7 years
Period which facility must operate and be in compliance	7 years	7 years
Obligation under Put Option	$ 130	$ 130
Extinguishment gain	$ 2,249
New Markets Tax Credit Transaction | Broadwind Services, LLC
New Markets Tax Credit program
Gross loan from AMCREF to Broadwind Services				$ 10,000

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