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Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 19, 2022 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) ft² T | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jun. 13, 2019 USD ($)
Accounts Receivable, Allowance for Credit Loss |  |  |  | $ 0 | $ 0 |  |
Financing Program Purchases of Distributors Financed |  |  |  | 6,303 | 9,022 | $ 15,782 |
Financing Program, Amount Owed By Distributors |  |  |  | 8,910 | 13,748 |  |
Financing Program, Repossessed Inventory Required To Be Repurchased |  |  |  | 0 | 0 |  |
Interest Expense, Debt |  |  |  | 198 | 476 |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  | 5,472 | 6,356 | 9,128 |
Truck Floor Plan Inventories, Net |  |  |  | 2,612 | 2,217 |  |
Bailment Pool Chassis Inventories, Net |  |  |  | $ 17,489 | 20,293 |  |
Number of Companies Upfit and Distribution Centers Subject to Lease Agreements |  |  |  | 22 |  |  |
Sale Leaseback Transaction, Gross Proceeds |  |  |  | $ 64,150 | 0 | 0 |
Depreciation |  |  |  | 10,370 | 11,142 | 10,418 |
Cost of Property Repairs and Maintenance |  |  |  | 7,060 | 6,925 | 6,750 |
Asset Impairment Charges | [1] |  |  | $ 1,224 | 0 | 0 |
Number of Reporting Units |  |  |  | 3 |  |  |
Goodwill |  |  |  | $ 113,134 | 113,134 |  |
Intangible Assets, Gross (Excluding Goodwill) |  |  |  | 273,755 | 273,755 |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  |  |  | 160,205 | 152,685 |  |
Finite-Lived Intangible Assets, Gross |  |  |  | 196,155 | 196,155 |  |
Advertising Expense |  |  |  | 4,033 | 4,823 | 4,699 |
Research and Development Expense |  |  |  | $ 8,397 | 10,081 | $ 12,159 |
Number of Operating Segments |  |  |  | 2 |  |  |
Other Noncurrent Liabilities [Member] | Credit Agreement [Member] | Asset Pledged as Collateral [Member] | Corporate Owned Life Insurance Policies [Member] |  |  |  |  |  |  |
Secured Debt |  |  |  | $ 546 | 750 |  |
Dejana Reporting Unit [Member] |  |  |  |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure |  |  |  | 17,600 |  |  |
Dejana Reporting Unit [Member] | Trade Names [Member] |  |  |  |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill), Ending Balance |  |  |  | 14,000 |  |  |
Distribution Rights [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  |  |  | 80,000 | 79,000 |  |
Finite-Lived Intangible Assets, Gross |  |  |  | $ 80,000 | 80,000 |  |
Distribution Rights [Member] | Minimum [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  | 15 years |  |  |
Distribution Rights [Member] | Maximum [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  | 20 years |  |  |
Trademarks [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  |  |  | $ 4,183 | 4,089 |  |
Finite-Lived Intangible Assets, Gross |  |  |  | $ 5,459 | 5,459 |  |
Trademarks [Member] | Minimum [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  | 7 years |  |  |
Trademarks [Member] | Maximum [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  | 25 years |  |  |
Patents [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  |  |  | $ 19,506 | 18,249 |  |
Finite-Lived Intangible Assets, Gross |  |  |  | $ 21,136 | 21,136 |  |
Patents [Member] | Minimum [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  | 7 years |  |  |
Patents [Member] | Maximum [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  | 20 years |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  |  |  | $ 47,876 | 42,707 |  |
Finite-Lived Intangible Assets, Gross |  |  |  | $ 80,920 | 80,920 |  |
Customer Relationships [Member] | Minimum [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  | 15 years |  |  |
Customer Relationships [Member] | Maximum [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  | 19 years 6 months |  |  |
Noncompete Agreements [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  |  |  | $ 8,640 | 8,640 |  |
Finite-Lived Intangible Assets, Gross |  |  |  | $ 8,640 | 8,640 |  |
Noncompete Agreements [Member] | Minimum [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  | 4 years |  |  |
Noncompete Agreements [Member] | Maximum [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  | 5 years |  |  |
Commercial Ice & Snow Unit [Member] |  |  |  |  |  |  |
Goodwill |  |  |  | $ 113,134 | 113,134 |  |
Municipal Reporting Unit [Member] |  |  |  |  |  |  |
Goodwill |  |  |  | 0 | 0 |  |
Dejana Reporting Unit [Member] |  |  |  |  |  |  |
Goodwill |  |  |  | $ 0 | 0 |  |
Leasehold Improvements [Member] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 12 years |  |  |
Software Development [Member] |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  | $ 1,224 |  |  |
Unrelated Third Party [Member] |  |  |  |  |  |  |
Sale Leaseback Transaction, Number of Properties Sold |  |  |  | 7 |  |  |
Sale Leaseback Transaction, Net Book Value |  |  |  | $ 21,852 |  |  |
Sale Leaseback Transaction, Gross Proceeds |  |  |  | 64,150 |  |  |
Sale Leaseback Transaction, Transaction Costs |  |  | $ 5,494 | 5,494 |  |  |
Sale Leaseback Transaction, Net Proceeds |  |  |  | $ 58,656 |  |  |
Area of Real Estate Property (Square Foot) | ft² |  |  |  | 780,000 |  |  |
Sale Leaseback Transaction, Lease Term (Year) |  |  |  | 15 years |  |  |
Sale Leaseback Transaction, Number of Renewal Options |  |  |  | 2 |  |  |
Sale Leaseback Transaction, Term of Renewal Option (Year) |  |  |  | 10 years |  |  |
Unrelated Third Party [Member] | WISCONSIN |  |  |  |  |  |  |
Sale Leaseback Transaction, Number of Facilities |  |  |  | 3 |  |  |
Unrelated Third Party [Member] | Illinois, Iowa, Maine, and Michigan [Member] |  |  |  |  |  |  |
Sale Leaseback Transaction, Number of Facilities |  |  |  | 4 |  |  |
Interest Rate Swap Effective May 31, 2019 Through May 31, 2024 [Member] |  |  |  |  |  |  |
Derivative Liability, Notional Amount |  |  |  | $ 175,000 |  |  | $ 175,000
Derivative, Fixed Interest Rate |  |  |  | 2.424% |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments and Tax |  |  |  | $ (485) | (1,163) |  |
Interest Expense, Debt |  |  |  | 198 | 476 |  |
Derivative, Notional Amount |  | $ 125,000 |  | $ 125,000 |  |  |
Derivative, Nonmonetary Notional Amount, Flow Rate, Percentage |  | 2.718% |  | 2.718% |  |  |
Derivative Liability |  |  |  | $ 1,732 | 2,984 |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  | 1,836 | 3,331 |  |
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |  |
Derivative Liability, Current |  |  |  | 1,712 | 3,174 |  |
Derivative Liability, Noncurrent |  |  |  | 628 | 859 |  |
Steel Hedging Instrument [Member] |  |  |  |  |  |  |
Derivative Liability |  |  |  | $ 54 |  |  |
Derivative, Nonmonetary Notional Amount, Mass (US Ton) | T |  |  |  | 3,000 |  |  |
Derivative, Fixed Payments |  |  |  | $ 819 |  |  |
Steel Hedging Instrument [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |  |
Derivative Liability | [2] |  |  | 54 | 0 |  |
Steel Hedging Instrument [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |  |
Derivative Liability, Current |  |  |  | 54 |  |  |
Steel Hedging Instrument [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Derivative Liability |  |  |  | 40 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  | $ 40 |  |  |
Derivative, Nonmonetary Notional Amount, Mass (US Ton) | T |  |  |  | 3,000 |  |  |
Derivative, Fixed Payments |  |  |  | $ 819 |  |  |
Work Truck Attachments [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss |  |  |  | 1,768 | 1,400 |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  |  |  | 111,945 | 109,551 |  |
Finite-Lived Intangible Assets, Gross |  |  |  | 177,765 | 177,765 |  |
Work Truck Solutions [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss |  |  |  | 604 | 246 |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  |  |  | 48,260 | 43,134 |  |
Finite-Lived Intangible Assets, Gross |  |  |  | $ 95,990 | $ 95,990 |  |
[1] | Reflects impairment charges taken on certain internally developed software in the year ended December 31, 2024.
[2] | Valuation models are calibrated to initial trade price. Subsequent valuations are based on observable inputs to the valuation model (e.g., market prices). Model inputs are changed only when corroborated by market data. Thus, inputs used to determine fair value of the interest rate swap are Level 2 inputs. Steel hedging instruments of $54 at December 31, 2024 are included in Accrued expenses and other current liabilities.

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