ACQUISITION - Intangible useful life (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Gears Acquisition
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Hy-Tech Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years	8 years 8 months 12 days
Hy-Tech Customer relationships [Member] | Gears Acquisition
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
Non-compete agreements [Member] | Gears Acquisition
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	4 years