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Condensed Consolidated Statements of Partners' Capital (Unaudited) - USD ($)
Total
Tier 2 [Member]
Tier 3 [Member]
General Partner [Member]
General Partner [Member]
Tier 2 [Member]
BUCs - Restricted and Unrestricted [Member]
BUCs - Restricted and Unrestricted [Member]
Tier 2 [Member]
BUCs - Restricted and Unrestricted [Member]
Tier 3 [Member]
Number of BUCs - Restricted and Unrestricted [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2021 $ 372,412,027     $ 765,550   $ 371,646,477       $ 114,040,260
Partners' Capital Account, Units at Dec. 31, 2021                 22,752,700  
Distributions paid or accrued:                    
Distribution of (income) loss (Note 3)   $ (9,721,430)     $ (2,430,358)   $ (7,291,072)      
Net income allocable to Partners 25,546,274     2,737,044   22,809,230        
Restricted unit compensation expense 173,898     1,739   172,159        
Unrealized gain (loss) on securities (47,751,656)     (477,517)   (47,274,139)       (47,751,656)
Unrealized loss on bond purchase commitments (819,081)     (8,191)   (810,890)       (819,081)
Balance at Mar. 31, 2022 339,840,032     588,267   339,251,765       65,469,523
Partners' Capital Account, Units at Mar. 31, 2022                 22,752,700  
Balance at Dec. 31, 2021 372,412,027     765,550   371,646,477       114,040,260
Partners' Capital Account, Units at Dec. 31, 2021                 22,752,700  
Distributions paid or accrued:                    
Net income allocable to Partners 60,236,558                  
Unrealized loss on bond purchase commitments (1,047,315)                  
Balance at Sep. 30, 2022 311,167,137     66,795   311,100,342       22,672,591
Partners' Capital Account, Units at Sep. 30, 2022                 22,844,926  
Balance at Mar. 31, 2022 339,840,032     588,267   339,251,765       65,469,523
Partners' Capital Account, Units at Mar. 31, 2022                 22,752,700  
Distributions paid or accrued:                    
Distribution of (income) loss (Note 3)   (1,620,764) $ (11,378,312)   (405,190)   (1,215,574) $ (11,378,312)    
Net income allocable to Partners 16,890,181     232,036   16,658,145        
Restricted units forfeited                 (902)  
Restricted unit compensation expense 165,509     1,655   163,854        
Unrealized gain (loss) on securities (19,880,002)     (198,800)   (19,681,202)       (19,880,002)
Unrealized loss on bond purchase commitments (136,370)     (1,364)   (135,006)       (136,370)
Rounding of BUCs related to BUCs Distributions/Reverse Unit Split                 1,315  
Balance at Jun. 30, 2022 323,880,274     216,604   323,663,670       45,453,151
Partners' Capital Account, Units at Jun. 30, 2022                 22,753,113  
Distributions paid or accrued:                    
Distribution of (income) loss (Note 3)   (280,799) (8,032,037)   (70,200)   (210,599) (8,032,037)    
Net income allocable to Partners 17,800,103     142,394   17,657,709        
Restricted units awarded                 91,813  
Restricted unit compensation expense 580,156     5,802   574,354        
Unrealized gain (loss) on securities (22,688,696)     (226,887)   (22,461,809)       (22,688,696)
Unrealized loss on bond purchase commitments (91,864)     (918)   (90,946)       (91,864)
Balance at Sep. 30, 2022 311,167,137     66,795   311,100,342       22,672,591
Partners' Capital Account, Units at Sep. 30, 2022                 22,844,926  
Balance at Dec. 31, 2022 323,955,517     285,571   323,669,946       43,748,239
Cumulative effect of accounting change (Note 2) (5,949,000)     (59,490)   (5,889,510)        
Partners' Capital Account, Units at Dec. 31, 2022                 22,821,972  
Distributions paid or accrued:                    
Regular distribution (1,175,563)     (11,756)   (1,163,807)        
Distribution of (income) loss (Note 3)   (9,660,884)     (2,415,221)   (7,245,663)      
Cash paid in lieu of fractional BUCs (2,639)         (2,639)        
Net income allocable to Partners 16,044,572     2,479,058   13,565,514        
Restricted units awarded                 102,087  
Restricted unit compensation expense 349,959     3,500   346,459        
Unrealized gain (loss) on securities 20,397,542     203,975   20,193,567       20,397,542
Unrealized loss on bond purchase commitments 112,547     1,125   111,422       112,547
Rounding of BUCs related to BUCs Distributions/Reverse Unit Split                 (151)  
Balance at Mar. 31, 2023 344,072,051     486,762   343,585,289       64,258,328
Partners' Capital Account, Units at Mar. 31, 2023                 22,923,908  
Balance at Dec. 31, 2022 323,955,517     285,571   323,669,946       43,748,239
Partners' Capital Account, Units at Dec. 31, 2022                 22,821,972  
Distributions paid or accrued:                    
Net income allocable to Partners 45,561,784                  
Unrealized loss on bond purchase commitments (211,377)                  
Balance at Sep. 30, 2023 297,377,260     19,833   297,357,427       4,660,633
Partners' Capital Account, Units at Sep. 30, 2023                 22,926,983  
Balance at Mar. 31, 2023 344,072,051     486,762   343,585,289       64,258,328
Partners' Capital Account, Units at Mar. 31, 2023                 22,923,908  
Distributions paid or accrued:                    
Regular distribution (2,002,209)     (20,022)   (1,982,187)        
Distribution of (income) loss (Note 3)   (3,513,629) (3,806,269)   (878,407)   (2,635,222) (3,806,269)    
Net income allocable to Partners 20,487,990     1,010,088   19,477,902        
Restricted units awarded                 2,155  
Restricted unit compensation expense 587,177     5,871   581,306        
Unrealized gain (loss) on securities (11,499,570)     (114,995)   (11,384,575)       (11,499,570)
Unrealized loss on bond purchase commitments (73,376)     (733)   (72,643)       (73,376)
Balance at Jun. 30, 2023 344,252,165     488,564   343,763,601       52,685,382
Partners' Capital Account, Units at Jun. 30, 2023                 22,926,063  
Distributions paid or accrued:                    
Regular distribution (8,448,633)     (84,486)   (8,364,147)        
Distribution of (income) loss (Note 3)   $ 259,677 $ (292,064)   $ 64,919   $ 194,758 $ (292,064)    
Cash paid in lieu of fractional BUCs (1,831)         (1,831)        
Net income allocable to Partners 9,029,222     25,049   9,004,173        
Restricted units awarded                 1,032  
Restricted unit compensation expense 603,473     6,035   597,438        
Unrealized gain (loss) on securities (47,774,201)     (477,742)   (47,296,459)       (47,774,201)
Unrealized loss on bond purchase commitments (250,548)     (2,506)   (248,042)       (250,548)
Rounding of BUCs related to BUCs Distributions/Reverse Unit Split                 (112)  
Balance at Sep. 30, 2023 $ 297,377,260     $ 19,833   $ 297,357,427       $ 4,660,633
Partners' Capital Account, Units at Sep. 30, 2023                 22,926,983