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, 2021	$ 372,412,027			$ 765,550		$ 371,646,477				$ 114,040,260
Partners' Capital Account, Units at Dec. 31, 2021									22,846,803
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									1,173
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									(22,540)
Unrealized losses on securities	(69,426,546)			(694,265)		(68,732,281)				(69,426,546)
Unrealized gains (losses) 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									22,916,320
Cumulative effect of accounting change (Note 2)	(5,949,000)			(59,490)		(5,889,510)
Distributions paid or accrued:
Regular distribution	(20,210,697)			(202,107)		(20,008,590)
Distribution of income (Note 3)		$ (12,992,591)	$ (4,020,578)		$ (3,248,148)		$ (9,744,443)	$ (4,020,578)
Cash paid in lieu of fractional BUCs	(6,202)					(6,202)
Net income allocable to Partners	51,143,118			3,589,447		47,553,671
Rounding of BUCs									(376)
Restricted units awarded									105,274
Restricted unit compensation expense	2,013,736			20,137		1,993,599
BUCs surrendered to pay tax withholding on vested restricted units	(483,255)					(483,255)
BUCs surrendered to pay tax withholding on vested restricted units, Units									(28,431)
Unrealized losses on securities	15,757,801			157,578		15,600,223				15,757,801
Unrealized gains (losses) on bond purchase commitments	98,859			989		97,870				98,859
Balance at Dec. 31, 2023	$ 349,306,708			$ 543,977		$ 348,762,731				$ 59,604,899
Partners' Capital Account, Units at Dec. 31, 2023									22,992,787