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SIGNIFICANT ACCOUNTING POLICIES (Detail Textuals 4)
12 Months Ended
Dec. 31, 2018
USD ($)
Supplier
Engine
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Significant Accounting Policies [Line Items]      
Goodwill $ 3,308,000 $ 3,308,000  
Research and development costs $ 822,000 $ 960,000 $ 858,000
Statutory federal income tax rate 21.00% 35.00% 35.00%
Number of supplier | Supplier 4    
Number of types of engines | Engine 3    
Methods of depreciation straight-line basis    
Earliest tax year      
Significant Accounting Policies [Line Items]      
Statutory federal income tax rate 35.00%    
Latest tax year      
Significant Accounting Policies [Line Items]      
Statutory federal income tax rate 21.00%    
Accounts Receivable      
Significant Accounting Policies [Line Items]      
Percentage of domestic shipments made pursuant to floor plan financing 68.00%