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Note 17 - Leases (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | $ 0 | $ 2,400,000 |
Operating Lease, Payments | 600,000 | 300,000 |
Property, Plant and Equipment, Gross, Ending Balance | 653,676,000 | 563,162,000 |
Property, Plant and Equipment, Net, Ending Balance | 450,825,000 | 387,275,000 |
Lessor, Operating Lease, Payments to be Received, Total | 15,242,000 |  |
Depreciation, Total | 56,168,000 | 55,107,000 | $ 49,387,000
Majority Shareholder [Member] |  |  |
Operating Lease, Payments | 1,129,231 |  |
Lessor, Operating Lease, Payments to be Received, Total | 12,100 |  |
Trucks under Operating Lease [Member] |  |  |
Property, Plant and Equipment, Gross, Ending Balance | 49,228,000 | 60,130,000 |
Property, Plant and Equipment, Net, Ending Balance | 24,708,000 | 33,757,000 |
Lessor, Operating Lease, Payments to be Received, Total | 15,242,000 | $ 18,792,000 |
Depreciation, Total | 6,200,000 |  |
Shop and Office Space [Member] | Majority Shareholder [Member] |  |  |
Property, Plant and Equipment, Gross, Ending Balance | 13,738,000 |  |
Property, Plant and Equipment, Net, Ending Balance | 12,402,000 |  |
Lessor, Operating Lease, Payments to be Received, Total | 705,000 |  |
Shop and Office Space [Member] |  |  |
Operating Leases, Future Minimum Payments Receivable, Total | 214,000 |  |
Leases without Early Cancellation Options [Member] | Other Noncurrent Assets [Member] |  |  |
Operating Lease, Right-of-Use Asset | $ 1,500,000 |  |
Maximum [Member] | Trucks [Member] |  |  |
Lessor, Operating Lease, Term of Contract (Month) | 60 months |  |
Maximum [Member] | Shop and Office Leases with Early Cancellation Options [Member] |  |  |
Lessee, Operating Lease, Term of Contract (Year) | 5 years |  |
Minimum [Member] | Trucks [Member] |  |  |
Lessor, Operating Lease, Term of Contract (Month) | 7 months |  |

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