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v3.20.1

Note 17 - Leases (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Lessee, Operating Lease, Term of Contract | 5 years |  |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | $ 2,400,000 |  |
Operating Lease, Payments | 300,000 |  |
Property, Plant and Equipment, Gross, Ending Balance | 563,162,000 | $ 492,325,000 |
Property, Plant and Equipment, Net, Ending Balance | 387,275,000 | 354,587,000 |
Lessor, Operating Lease, Payments to be Received, Total | 18,792,000 |  |
Depreciation, Total | 55,107,000 | 49,387,000 | $ 42,274,000
Operating Leases, Future Minimum Payments Receivable, Total |  | 22,319,000 |
Majority Shareholder [Member] |  |  |
Operating Lease, Payments | 813,756 |  |
Trucks under Operating Lease [Member] |  |  |
Property, Plant and Equipment, Gross, Ending Balance | 60,130,000 |  |
Property, Plant and Equipment, Net, Ending Balance | 33,757,000 |  |
Lessor, Operating Lease, Payments to be Received, Total | 18,792,000 | 22,319,000 |
Depreciation, Total | 6,700,000 |  |
Shop and Office Space [Member] | Majority Shareholder [Member] |  |  |
Property, Plant and Equipment, Gross, Ending Balance | 1,697,000 |  |
Property, Plant and Equipment, Net, Ending Balance | 1,080,000 |  |
Lessor, Operating Lease, Payments to be Received, Total | $ 12,000 |  |
Trucks [Member] |  |  |
Property Subject to or Available for Operating Lease, Gross |  | 61,061,000 |
Property Subject to or Available for Operating Lease, Net, Total |  | 34,299,000 |
Trucks [Member] | Minimum [Member] |  |  |
Lessor, Operating Lease, Term of Contract | 7 years |  |
Trucks [Member] | Maximum [Member] |  |  |
Lessor, Operating Lease, Term of Contract | 60 years |  |
Building [Member] |  |  |
Property Subject to or Available for Operating Lease, Gross |  | 1,697,000 |
Property Subject to or Available for Operating Lease, Net, Total |  | 1,138,000 |
Operating Leases, Future Minimum Payments Receivable, Total |  | 12,000 |
Shop and Office Space [Member] |  |  |
Operating Leases, Future Minimum Payments Receivable, Total |  | $ 284,000 |
Operating Lease Liabilities [Member] |  |  |
Operating Lease, Liability, Total | $ 2,100,000 |  |
Accrued Expenses And Other Liabilities And Other Long-term Liabilities [Member] |  |  |
Operating Lease, Liability, Total | 2,098,000 |  |
Operating Lease, Right-of-Use Asset | $ 2,098,000 |  |

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