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Note 17 - Leases (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating Lease, Right-of-Use Asset | $ 100,000 |  |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 0 |  |
Operating Lease, Payments | 300,000 | $ 500,000 |
Property, Plant and Equipment, Gross, Ending Balance | 771,131,000 | 705,919,000 |
Property, Plant and Equipment, Net, Total | 504,719,000 | 463,595,000 |
Lessor, Operating Lease, Payments to be Received, Total | 14,268,000 |  |
Depreciation | 64,605,000 | 62,806,000 | $ 55,012,000
Majority Shareholder [Member] |  |  |
Lessor, Operating Lease, Payments to be Received, Total | 32,100 |  |
Trucks under Operating Lease [Member] |  |  |
Property, Plant and Equipment, Gross, Ending Balance | 57,790,000 | 58,227,000 |
Property, Plant and Equipment, Net, Total | 32,595,000 | 22,960,000 |
Lessor, Operating Lease, Payments to be Received, Total | 14,268,000 | $ 11,549,000 |
Depreciation | 4,900,000 |  |
Shop and Office Space [Member] |  |  |
Operating Lease, Liability | 64,200 |  |
Shop and Office Space [Member] | Majority Shareholder [Member] |  |  |
Operating Lease, Payments | 1,540,102 |  |
Property, Plant and Equipment, Gross, Ending Balance | 13,738,000 |  |
Property, Plant and Equipment, Net, Total | 11,305,000 |  |
Lessor, Operating Lease, Payments to be Received, Total | 32,100 |  |
Property, Plant, and Equipment, Lessor Asset under Operating Lease, before Accumulated Depreciation | 13,738,000 |  |
Property, Plant, and Equipment, Lessor Asset under Operating Lease, after Accumulated Depreciation | $ 11,305,000 |  |
Trucks under Operating Lease [Member] |  |  |
Lessor, Operating Lease, Term of Contract (Year) | 5 years |  |
Maximum [Member] | Trucks [Member] |  |  |
Lessor, Operating Lease, Term of Contract (Year) | 60 years |  |
Maximum [Member] | Shop and Office Leases with Early Cancellation Options [Member] |  |  |
Lessee, Operating Lease, Term of Contract (Year) | 5 years |  |

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