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Note 4 - Derivative Instruments and Hedging Activities (Details Textual) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2017 | Dec. 31, 2019 USD ($)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  | $ 1,003 | $ (2,721) | $ (18,406) | $ (14,898) |  |
Derivative Assets (Liabilities), Net Fair Value of Derivative Contracts, Excluding Impact of Credit Risk |  | $ (34,134) |  | $ (34,134) |  |  | $ (10,588)
Commodity Contract [Member] |  |  |  |  |  |  |
Derivative, Number of Instruments Held, Total |  | 0 |  | 0 |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |
Number of New Contracts Entered | 3 |  |  |  |  | 20 |
Derivative, Number of Instruments Outstanding |  | 15 |  | 15 |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  | $ 1,003 | $ (2,721) | $ (18,406) | $ (14,898) |  |

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- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 + Details
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