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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
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.