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Note 1 - Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Number of Operating Segments | 5 |  |
Loss on Deposits Above FDIC Amount | $ 0 |  |
Accounts Receivable, Allowance for Credit Loss, Current | 500,000 | $ 348,000 |
Letters of Credit Outstanding, Amount | $ 16,100,000 | $ 18,500,000 |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Walmart [Member] |  |  |
Concentration Risk, Percentage | 21.00% | 23.00% | 24.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | The Coca-Cola Company [Member] |  |  |
Concentration Risk, Percentage | 7.00% | 9.00% | 12.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | UNITED STATES |  |  |
Concentration Risk, Percentage | 99.00% | 99.00% | 99.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Walmart [Member] |  |  |
Concentration Risk, Percentage | 22.00% | 22.00% |
Uninsured Risk [Member] | Auto Liability Claim [Member] |  |  |
Loss Contingency Range Possible Loss Per Claim | $ 1,000,000.0 |  |
Uninsured Risk [Member] | Workers Compensation Liability Claim [Member] |  |  |
Loss Contingency Range Possible Loss Per Claim | 750,000 |  |
Insurance Claims [Member] |  |  |
Letters of Credit Outstanding, Amount | 16,100,000 |  |
Supplies and Maintenance Costs [Member] |  |  |
Amortization, Total | $ 6,600,000 | $ 6,400,000 | $ 6,600,000
Tractor [Member] |  |  |
Replacement Of Equipment Period After Purchase (Year) | 3 years 10 months 24 days |  |
Useful life (Year) | 5 years |  |
Property, Plant and Equipment, Salvage Value, Percentage | 25.00% |  |
Trailer [Member] |  |  |
Replacement Of Equipment Period After Purchase (Year) | 6 years 8 months 12 days |  |
Useful life (Year) | 7 years |  |
Property, Plant and Equipment, Salvage Value, Percentage | 35.00% |  |
Refrigerated Containers [Member] |  |  |
Useful life (Year) | 12 years |  |
Property, Plant and Equipment, Salvage Value, Percentage | 0.00% |  |
Tires In Service [Member] |  |  |
Useful life (Year) | 24 months |  |

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