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Note 9 - Equity Method Investment (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | May 31, 2011
Proceeds from Sale of Property, Plant, and Equipment, Total | $ 61,687 | $ 48,749 | $ 65,507 |
Payments to Acquire Property, Plant, and Equipment, Total | 75,142 | 110,802 | 112,794 |
Income (Loss) from Equity Method Investments, Total | 7,732 | 3,400 | 3,000 |
Equity Method Investments | $ 26,106 | 20,145 |  |
Transport Enterprise Leasing LLC [Member] |  |  |  |
Equity Method Investment, Ownership Percentage | 49.00% |  |  | 49.00%
Option to Acquire Interest in Equity Method Investment, Percentage of Ownership | 51.00% |  |  |
Proceeds from Sale of Property, Plant, and Equipment, Total | $ 100 | 100 |  |
Revenue from Related Parties | 8,200 | 5,900 |  |
Payments to Acquire Property, Plant, and Equipment, Total | 1,800 |  |  |
Payments for Rent | 900 | 500 |  |
Deferred Gain on Sale of Property | 200 | 200 |  |
Due from Related Parties, Total | 7,200 | 8,600 |  |
Income (Loss) from Equity Method Investments, Total | 7,700 | 3,400 | 3,000 |
Proceeds from Equity Method Investment, Distribution | 2,000 | 2,000 | $ 1,500 |
Equity Method Investments | 26,100 | 20,100 |  |
Equity Method Investment, Aggregate Cost | 4,900 |  |  |
Transport Enterprise Leasing LLC [Member] | Reduction in TEL Investment [Member] |  |  |  |
Deferred Gain on Sale of Property | $ 200 | $ 400 |  |

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