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Note 9 - Equity Method Investment (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Proceeds from Sale of Property, Plant, and Equipment, Total |  |  | $ 49,302 | $ 32,739 |
Income (Loss) from Equity Method Investments, Total | $ 2,142 | $ 750 | 5,407 | 2,575 |
Transport Enterprise Leasing LLC [Member] |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment, Total |  |  | 100 | 100 |
Revenue from Related Parties |  |  | 5,900 | 4,200 |
Deferred Gain on Sale of Property | $ 200 | $ 200 | $ 200 | $ 200 |
Equity Method Investment, Ownership Percentage | 49.00% |  | 49.00% |  |
Due from Related Parties, Total | $ 5,700 |  | $ 5,700 |  | $ 7,800
Equity Method Investments | 25,700 |  | 25,700 |  | $ 20,100
Transport Enterprise Leasing LLC [Member] | Reduction in TEL Investment [Member] |  |  |  |  |
Deferred Gain on Sale of Property | $ 200 |  | $ 200 |  |

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