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SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Product Information [Line Items] |  |  |
Statutory federal income tax rate | 21.00% | 21.00% | 21.00%
Retirement age of eligible employees for future retirement benefit | 65 years |  |
Goodwill and Other Intangibles |  |  |
Goodwill | $ 3,308,000 | $ 3,308,000 |
Impairment of goodwill or trade names | $ 0 | 0 | $ 0
Minimum |  |  |
Product Information [Line Items] |  |  |
Retirement age of eligible employees for future retirement benefit | 59 years 6 months |  |
Maximum |  |  |
Product Information [Line Items] |  |  |
Retirement age of eligible employees for future retirement benefit | 55 years |  |
Selling, general and administrative expenses |  |  |
Product Information [Line Items] |  |  |
Research and development costs | $ 776,000 | $ 751,000 | $ 730,000
Accounts Receivable | Customer Concentration Risk | Domestic |  |  |
Product Information [Line Items] |  |  |
Percentage of domestic shipments made pursuant to floor plan financing | 51.00% |  |
Supplier Concentration Risk |  |  |
Product Information [Line Items] |  |  |
Number of supplier | item | 4 |  |
Number of types of engines | item | 3 |  |

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