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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
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Sep. 30, 2023 | Aug. 31, 2023 | Jun. 30, 2023 | May 31, 2023 | Mar. 31, 2023 | [1] | Feb. 28, 2023 | Aug. 31, 2022 | May 31, 2022 | Feb. 28, 2022 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022
Distributions, common units |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,669 | $ 9,669 | $ 40,900 | $ 9,571 | $ 9,570 | $ 5,672
Preferred Partner [Member] | Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) |  |  | $ 30 |  | $ 30 |  | $ 0 |  | $ 30 |  | $ 30 | $ 30 | $ 30 |  |  |  |  |  |  |
Distribution, preferred stock |  |  | $ 3,650 |  | $ 6,075 |  | $ 0 |  | $ 7,500 |  | $ 7,500 | $ 7,500 | $ 7,500 |  |  |  |  |  |  |
Preferred Partner [Member] | Preferred Stock [Member] | Feb 2023 Redeemed Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [2] |  |  |  |  |  |  |  | $ 12.33 |  |  |  |  |  |  |  |  |  |  |
Distribution, preferred stock | [2] |  |  |  |  |  |  |  | $ 586 |  |  |  |  |  |  |  |  |  |  |
Preferred Partner [Member] | Preferred Stock [Member] | May 2023 Redeemed Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [3] |  |  |  | $ 11.33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution, preferred stock | [3] |  |  |  | $ 406 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Partner [Member] | Preferred Stock [Member] | June 2023 Redeemed Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [4] |  |  | $ 20.33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution, preferred stock | [4] |  |  | $ 915 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Partner [Member] | Preferred Stock [Member] | August 2023 Redeemed Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) |  |  | $ 12.33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution, preferred stock |  |  | $ 432 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Partner [Member] | Preferred Stock [Member] | September 2023 Redeemed Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) |  | $ 23.67 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution, preferred stock |  | $ 355 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Partner [Member] | Preferred Stock [Member] | February 2022 Redeemed Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 13.35 |  |  |  |  |  |  |
Distribution, preferred stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 258 |  |  |  |  |  |  |
Common Unitholders, General Partner [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) |  |  |  |  | $ 0.75 |  | $ 2.43 |  | $ 0.75 |  | $ 0.75 | $ 0.75 | $ 0.45 |  |  |  |  |  |  |
Distributions, common units |  |  |  |  | $ 9,669 | [5] | $ 31,329 | [5] | $ 9,571 | [5] | $ 9,571 | $ 9,570 | $ 5,672 | [5] |  |  |  |  |  |
Common Unitholders, General Partner [Member] | Feb 2023 Redeemed Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [2] |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |
Distributions, common units | [2],[5] |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |
Common Unitholders, General Partner [Member] | May 2023 Redeemed Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [3] |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions, common units | [3],[5] |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Unitholders, General Partner [Member] | June 2023 Redeemed Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [4] |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions, common units | [4],[5] |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Unitholders, General Partner [Member] | August 2023 Redeemed Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [6] |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions, common units |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Unitholders, General Partner [Member] | September 2023 Redeemed Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [7] | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions, common units |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Unitholders, General Partner [Member] | February 2022 Redeemed Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution per unit, common units (in dollars per share) | [8] |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |
Distributions, common units | [5] |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |
[1] | Special distribution was made to help cover unitholder tax liabilities associated with owning NRP's common units during 2022.
[2] | Relates to accrued distribution paid upon the redemption of 47,499 preferred units in February 2023.
[3] | Relates to accrued distribution paid upon the redemption of 35,834 preferred units in May 2023.
[4] | Relates to accrued distribution paid upon the redemption of 45,000 preferred units in June 2023.
[5] | Totals include the amount paid to NRP's general partner in accordance with the general partner's 2% general partner interest.
[6] | Relates to accrued distribution paid upon the redemption of 35,000 preferred units in August 2023.
[7] | Relates to accrued distribution paid upon the redemption of 15,001 preferred units in September 2023.
[8] | Relates to accrued distribution paid upon the redemption of 19,321 preferred units paid-in-kind in February 2022.

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