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ACQUISITION - Purchase price allocation (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Business Acquisition [Line Items]    
Goodwill $ 4,438,000 $ 4,726,000
Gears Acquisition    
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  
Gears Acquisition | Trademarks and Trade Names [Member]    
Business Acquisition [Line Items]    
Trademarks and trade names 54,000  
Gears Acquisition | Customer relationships [Member]    
Business Acquisition [Line Items]    
Customer relationships 995,000  
Gears Acquisition | Non-compete agreements [Member]    
Business Acquisition [Line Items]    
Non-compete agreements $ 95,000