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Note 4 - Common and Preferred Unit Distributions - Distributions Made to Partners (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2025 | Feb. 28, 2025 | Mar. 31, 2024 | Feb. 29, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Distributions, common units |  |  |  |  |  | $ 26,276 | $ 42,186
Preferred Partner [Member] | Preferred Stock [Member] |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) |  |  | $ 0 |  | $ 30 |  |
Distribution, preferred stock |  |  | $ 0 |  | $ 2,150 |  |
Preferred Partner [Member] | Preferred Stock [Member] | March 2025 Special Distribution [Member] |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [1] | $ 0 |  |  |  |  |
Distribution, preferred stock | [1] | $ 0 |  |  |  |  |
Preferred Partner [Member] | Preferred Stock [Member] | March 2024 Special Distribution [Member] |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [2] |  |  | $ 0 |  |  |
Distribution, preferred stock | [2] |  |  | $ 0 |  |  |
Common Unitholders, General Partner [Member] |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) |  |  | $ 0.75 |  | $ 0.75 |  |
Distributions, common units | [3] |  | $ 10,055 |  | $ 9,918 |  |
Common Unitholders, General Partner [Member] | March 2025 Special Distribution [Member] |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [1] | $ 1.21 |  |  |  |  |
Distributions, common units | [1],[3] | $ 16,221 |  |  |  |  |
Common Unitholders, General Partner [Member] | March 2024 Special Distribution [Member] |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [2] |  |  | $ 2.44 |  |  |
Distributions, common units | [2],[3] |  |  | $ 32,268 |  |  |
[1] | Special distribution was made to help cover unitholder tax liabilities associated with owning NRP's common units during 2024.
[2] | Special distribution was made to help cover unitholder tax liabilities associated with owning NRP's common units during 2023.
[3] | Totals include the amount paid to NRP's general partner in accordance with the general partner's 2% general partner interest.

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