Note 6 - Fair Value - Reconciliation of Level 3 Assets (Details)	9 Months Ended
	Sep. 30, 2025 USD ($)
Unrealized appreciation (depreciation)	$ (117,325)
Fair Value, Inputs, Level 3 [Member]
Fair value, balance	315,250
Purchases	0
Sales	0
Realized gains (losses)	(24,129,015)
Unrealized appreciation (depreciation)	24,011,690	[1]
Transfers	0
Fair value, balance	197,925
Common Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, balance	260,497
Purchases	0
Sales	0
Realized gains (losses)	0
Unrealized appreciation (depreciation)	(88,969)	[1]
Transfers	0
Fair value, balance	171,528
Common Stock [Member] | Advanced Materials Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, balance	260,497
Purchases	0
Sales	0
Realized gains (losses)	0
Unrealized appreciation (depreciation)	(88,969)	[1]
Transfers	0
Fair value, balance	171,528
Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, balance	29,466
Purchases	0
Sales	0
Realized gains (losses)	0
Unrealized appreciation (depreciation)	(6,293)	[1]
Transfers	0
Fair value, balance	23,173
Preferred Stock [Member] | Equipment Leasing Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, balance	29,466
Purchases	0
Sales	0
Realized gains (losses)	0
Unrealized appreciation (depreciation)	(6,293)	[1]
Transfers	0
Fair value, balance	23,173
Debt [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, balance	25,287
Purchases	0
Sales	0
Realized gains (losses)	(24,129,015)
Unrealized appreciation (depreciation)	24,106,952	[1]
Transfers	0
Fair value, balance	3,224
Debt [Member] | Automotive Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, balance	0
Purchases	0
Sales	0
Realized gains (losses)	(24,129,015)
Unrealized appreciation (depreciation)	24,129,015	[1]
Transfers	0
Fair value, balance	0
Debt [Member] | Medical Devices Sector [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, balance	25,287
Purchases	0
Sales	0
Realized gains (losses)	0
Unrealized appreciation (depreciation)	(22,063)	[1]
Transfers	0
Fair value, balance	$ 3,224

[1] The net change in unrealized appreciation (depreciation) from Level 3 instruments held as of June 30, 2025 was $(97,224).