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Condensed Consolidated Statements of Changes in Partnership Capital (Unaudited) (Parentheticals) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Limited Partner [Member]        
Distributions, per unit (in dollars per share) $ 0.480528 $ 0.226318 $ 1.026229 $ 1.065451