Consolidated Statements of Partners' Capital - 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, 2020	$ 359,772,042			$ 934,892		$ 358,837,150				$ 132,594,007
Partners' Capital Account, Units at Dec. 31, 2020									20,700,399
Distributions paid or accrued:
Regular distribution	(17,782,023)			(177,820)		(17,604,203)
Distribution of income (Note 3)		$ (10,596,968)	$ (6,507,605)		$ (2,649,242)		$ (7,947,726)	$ (6,507,605)
Net income allocable to Partners	35,228,437			2,830,481		32,397,956
Sale of BUCs, net of issuance costs, Value	31,239,495					31,239,495
Sale of BUCs, net of issuance costs, Units									1,859,160
Repurchase of BUCs, Value	(1,363,736)					(1,363,736)
Repurchase of BUCs, Units									(75,713)
Restricted units awarded									88,775
Restricted unit compensation expense	1,277,694			12,777		1,264,917
BUCs surrendered to pay tax withholding on vested restricted units	(301,562)					(301,562)
BUCs surrendered to pay tax withholding on vested restricted units, Units									(15,021)
Unrealized loss on securities	(19,086,272)			(190,863)		(18,895,409)				(19,086,272)
Unrealized gain on bond purchase commitments	532,525			5,325		527,200				532,525
Balance at Dec. 31, 2021	372,412,027			765,550		371,646,477				114,040,260
Partners' Capital Account, Units at Dec. 31, 2021									22,557,600
Distributions paid or accrued:
Regular distribution	(2,127,734)			(21,277)		(2,106,457)
Distribution of income (Note 3)		$ (12,969,459)	$ (26,835,826)		$ (3,242,365)		$ (9,727,094)	$ (26,835,826)
Cash paid in lieu of fractional BUCs	(2,506)					(2,506)
Net income allocable to Partners	62,695,541			3,471,267		59,224,274
Rounding of BUCs upon Reverse Unit Split									1,160
Restricted units awarded									96,321
Restricted units forfeited									(5,437)
Restricted unit compensation expense	1,531,622			15,316		1,516,306
BUCs surrendered to pay tax withholding on vested restricted units	(456,127)					(456,127)
BUCs surrendered to pay tax withholding on vested restricted units, Units									(23,281)
Unrealized loss on securities	(69,426,546)			(694,265)		(68,732,281)				(69,426,546)
Unrealized gain on bond purchase commitments	(865,475)			(8,655)		(856,820)				(865,475)
Balance at Dec. 31, 2022	$ 323,955,517			$ 285,571		$ 323,669,946				$ 43,748,239
Partners' Capital Account, Units at Dec. 31, 2022									22,626,363