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Note 11 - Investments in Affiliates (Details Textual) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Assets, Total | $ 2,488,273 | $ 2,561,756 | $ 2,379,996
Equity Method Investment, Other than Temporary Impairment | 9,600 |  |
Foreign Affiliates [Member] |  |  |
Number of Entities |  | 13 |
Equity Method Investment, Other than Temporary Impairment | 9,600 |  |
Foreign Affiliates [Member] | Minimum [Member] |  |  |
Assets, Total |  | $ 100 |
Equity Method Investment, Ownership Percentage |  | 25.00% |
Foreign Affiliates [Member] | Maximum [Member] |  |  |
Assets, Total |  | $ 84,400 |
Equity Method Investment, Ownership Percentage |  | 50.00% |
Real Estate Entities [Member] |  |  |
Assets, Total | 13,200 | $ 75,500 |
Number of Entities |  | 2 |
Real Estate Entities [Member] | Minimum [Member] |  |  |
Equity Method Investment, Ownership Percentage |  | 10.00% |
Real Estate Entities [Member] | Maximum [Member] |  |  |
Equity Method Investment, Ownership Percentage |  | 25.00% |
Asphalt Terminal Entity [Member] |  |  |
Assets, Total |  | $ 33,400 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |  |
Assets, Total | $ 282,004 | $ 324,203 | $ 298,502

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