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ACQUISITION - Purchase price allocation (Details) - USD ($)
Mar. 31, 2022
Dec. 31, 2021
Business Acquisition [Line Items]    
Goodwill $ 5,275,000 $ 4,447,000
Business of Jackson Gear Company    
Business Acquisition [Line Items]    
Accounts receivable 490,000  
Inventories 369,000  
Machinery and equipment 823,000  
Goodwill 833,000  
Liabilities assumed (215,000)  
Total estimated purchase price $ 2,300,000