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Note 5 - Common and Preferred Unit Distributions - Distributions Made to Partners (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended | 22 Months Ended
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Nov. 30, 2024 | Sep. 30, 2024 | [1] | Aug. 31, 2024 | May 31, 2024 | Mar. 31, 2024 | Feb. 29, 2024 | Nov. 30, 2023 | Sep. 30, 2023 | [2] | Aug. 31, 2023 | Jun. 30, 2023 | [3] | May 31, 2023 | Mar. 31, 2023 | Feb. 28, 2023 | Nov. 30, 2022 | Aug. 31, 2022 | May 31, 2022 | Feb. 28, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | May 31, 2024
Distributions, common units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 72,146 | $ 69,908 | $ 34,384 |
Preferred Partner [Member] | Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) |  | $ 0 | $ 20.68 | $ 30 | $ 30 |  | $ 30 | $ 30 | $ 23.67 | $ 30 | $ 20.33 | $ 30 |  | $ 30 | $ 30 | $ 30 | $ 30 | $ 30 |  |  |  |
Distribution, preferred stock |  | $ 0 | $ 655 | $ 950 | $ 2,150 |  | $ 2,150 | $ 2,150 | $ 355 | $ 3,650 | $ 915 | $ 6,075 |  | $ 7,500 | $ 7,500 | $ 7,500 | $ 7,500 | $ 7,500 |  |  |  |
Preferred Partner [Member] | Preferred Stock [Member] | March 2024 Special Distribution [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [4] |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution, preferred stock | [4] |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Partner [Member] | Preferred Stock [Member] | Distributions Covering April 1 - May 8, 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [5] |  |  |  | $ 12.33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution, preferred stock | [5] |  |  |  | $ 493 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Partner [Member] | Preferred Stock [Member] | Distributions Covering January 1 - February 8, 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [6] |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.33 |  |  |  |  |  |  |  |
Distribution, preferred stock | [6] |  |  |  |  |  |  |  |  |  |  |  |  | $ 586 |  |  |  |  |  |  |  |
Preferred Partner [Member] | Preferred Stock [Member] | March 2023 Special Distribution [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [7] |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
Distribution, preferred stock | [7] |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
Preferred Partner [Member] | Preferred Stock [Member] | Distributions Covering April 1 - May 5, 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [8] |  |  |  |  |  |  |  |  |  |  | $ 11.33 |  |  |  |  |  |  |  |  |  |
Distribution, preferred stock | [8] |  |  |  |  |  |  |  |  |  |  | $ 406 |  |  |  |  |  |  |  |  |  |
Preferred Partner [Member] | Preferred Stock [Member] | Distributions Covering June 30 - August 8, 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [9] |  |  |  |  |  |  |  |  | $ 12.33 |  |  |  |  |  |  |  |  |  |  |  |
Distribution, preferred stock | [9] |  |  |  |  |  |  |  |  | $ 432 |  |  |  |  |  |  |  |  |  |  |  |
Preferred Partner [Member] | Preferred Stock [Member] | Distributions Covering January 1 - February 8, 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [10] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13.35 |  |  |  |
Distribution, preferred stock | [10] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 258 |  |  |  |
Common Unitholders, General Partner [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) |  | $ 0.75 | $ 0 | $ 0.75 | $ 0.75 |  | $ 0.75 | $ 0.75 | $ 0 | $ 0.75 | $ 0 | $ 0.75 |  | $ 0.75 | $ 0.75 | $ 0.75 | $ 0.75 | $ 0.45 |  |  |  |
Distributions, common units | [11] | $ 9,987 | $ 0 | $ 9,986 | $ 9,987 |  | $ 9,918 | $ 9,670 | $ 0 | $ 9,669 | $ 0 | $ 9,669 |  | $ 9,571 | $ 9,571 |  | $ 9,570 | $ 5,672 |  |  |  | $ 9,571
Common Unitholders, General Partner [Member] | March 2024 Special Distribution [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [4] |  |  |  |  | $ 2.44 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions, common units | [4],[11] |  |  |  |  | $ 32,268 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Unitholders, General Partner [Member] | Distributions Covering April 1 - May 8, 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [5] |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions, common units | [5],[11] |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Unitholders, General Partner [Member] | Distributions Covering January 1 - February 8, 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [6] |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |
Distributions, common units | [6],[11] |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |
Common Unitholders, General Partner [Member] | March 2023 Special Distribution [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [7] |  |  |  |  |  |  |  |  |  |  |  | $ 2.43 |  |  |  |  |  |  |  |  |
Distributions, common units | [7],[11] |  |  |  |  |  |  |  |  |  |  |  | $ 31,329 |  |  |  |  |  |  |  |  |
Common Unitholders, General Partner [Member] | Distributions Covering April 1 - May 5, 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [8] |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |
Distributions, common units | [8],[11] |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |
Common Unitholders, General Partner [Member] | Distributions Covering June 30 - August 8, 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [9] |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Distributions, common units | [9],[11] |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Common Unitholders, General Partner [Member] | Distributions Covering January 1 - February 8, 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [10] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Distributions, common units | [10],[11] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
[1] | Relates to accrued distribution paid upon the redemption of 31,666 preferred units in September 2024.
[2] | Relates to accrued distribution paid upon the redemption of 15,001 preferred units in September 2023.
[3] | Relates to accrued distribution paid upon the redemption of 45,000 preferred units in June 2023.
[4] | Special distribution was made to help cover unitholder tax liabilities associated with owning NRP common units during 2023.
[5] | Relates to accrued distribution paid upon the redemption of 40,000 preferred units in May 2024
[6] | Relates to accrued distribution paid upon the redemption of 47,499 preferred units in February 2023.
[7] | Special distribution was made to help cover unitholder tax liabilities associated with owning NRP's common units during 2022.
[8] | Relates to accrued distribution paid upon the redemption of 35,834 preferred units in May 2023.
[9] | Relates to accrued distribution paid upon the redemption of 35,000 preferred units in August 2023.
[10] | Relates to accrued distribution paid upon the redemption of 19,321 preferred units paid-in-kind in February 2022.
[11] | 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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