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Revenue Recognition (Revenue by customer and timing recognitions) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) item | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |  |
Retained Earnings | $ 49,707 |  | $ 49,707 |  | $ 47,712
Net sales | 127,636 | $ 133,761 | 388,508 | $ 321,994 |
Independent dealer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 106,798 | 101,671 | 319,449 | 248,499 |
Government |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 10,942 | 19,058 | 32,858 | 41,248 |
Fleet |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 8,539 | 11,277 | 29,179 | 27,639 |
Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 1,357 | 1,755 | 7,022 | 4,608 |
Point in time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 110,574 | 115,467 | 330,593 | 268,512 |
Over time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 17,062 | 18,294 | $ 57,915 | 53,482 |
Work Truck Attachments |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Number of revenue streams | item |  |  | 2 |  |
Net sales | 81,373 | 76,903 | $ 227,992 | 169,853 |
Work Truck Attachments | Independent dealer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 81,373 | 76,903 | 227,992 | 169,853 |
Work Truck Attachments | Point in time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 81,373 | 76,903 | $ 227,992 | 169,853 |
Work Truck Solutions |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Number of revenue streams | item |  |  | 4 |  |
Net sales | 46,263 | 56,858 | $ 160,516 | 152,141 |
Work Truck Solutions | Independent dealer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 25,425 | 24,768 | 91,457 | 78,646 |
Work Truck Solutions | Government |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 10,942 | 19,058 | 32,858 | 41,248 |
Work Truck Solutions | Fleet |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 8,539 | 11,277 | 29,179 | 27,639 |
Work Truck Solutions | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 1,357 | 1,755 | 7,022 | 4,608 |
Work Truck Solutions | Point in time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 29,201 | 38,564 | 102,601 | 98,659 |
Work Truck Solutions | Over time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 17,062 | 18,294 | 57,915 | 53,482 |
Effect of Change Higher/(Lower) | ASC 2014-09 | Work Truck Solutions | Over time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | $ 92 | $ 216 | $ 168 | $ 406 |

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