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Revenue Recognition (Revenue by customer and timing recognitions) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Retained Earnings | $ 51,881 |  |  |  | $ 47,712 |  |  |  | $ 51,881 | $ 47,712 |
Net sales | $ 152,945 | $ 127,636 | $ 157,530 | $ 103,342 | $ 158,160 | $ 133,761 | $ 120,043 | $ 68,190 | 541,453 | 480,154 | $ 571,710
Independent dealer |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 447,056 | 367,030 | 421,114
Government |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 46,107 | 62,762 | 72,810
Fleet |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 38,669 | 42,590 | 66,306
Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 9,621 | 7,772 | 11,480
Point in time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 463,611 | 402,513 | 465,899
Over time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 77,842 | 77,641 | 105,811
Work Truck Attachments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of revenue streams | item |  |  |  |  |  |  |  |  | 2 |  |
Net sales |  |  |  |  |  |  |  |  | $ 325,707 | 252,838 | 293,630
Work Truck Attachments | Independent dealer |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 325,707 | 252,838 | 293,630
Work Truck Attachments | Point in time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 325,707 | 252,838 | 293,630
Work Truck Solutions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of revenue streams | item |  |  |  |  |  |  |  |  | 4 |  |
Net sales |  |  |  |  |  |  |  |  | $ 215,746 | 227,316 | 278,080
Work Truck Solutions | Independent dealer |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 121,349 | 114,192 | 127,484
Work Truck Solutions | Government |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 46,107 | 62,762 | 72,810
Work Truck Solutions | Fleet |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 38,669 | 42,590 | 66,306
Work Truck Solutions | Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 9,621 | 7,772 | 11,480
Work Truck Solutions | Point in time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 137,904 | 149,675 | 172,269
Work Truck Solutions | Over time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 77,842 | 77,641 | 105,811
Effect of Change Higher/(Lower) | ASC 2014-09 | Work Truck Solutions | Over time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 373 | $ (542) | $ (251)

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