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ACQUISITION - Purchase price allocation (Details) - Gears Acquisition
Mar. 31, 2020
USD ($)
Business Acquisition [Line Items]  
Accounts receivable $ 218,000
Inventories 630,000
Machinery, equipment and vehicle 1,437,000
Liabilities assumed (131,000)
Goodwill 284,000
Total estimated purchase price 3,582,000
Trademarks and Trade Names [Member]  
Business Acquisition [Line Items]  
Trademarks and trade names 54,000
Customer Relationships [Member]  
Business Acquisition [Line Items]  
Customer relationships 995,000
Non-compete agreements [Member]  
Business Acquisition [Line Items]  
Non-compete agreements $ 95,000