Note 3 - Investments - Portfolio Composition by Geographical Classification (Details) - USD ($)		Sep. 30, 2025	Dec. 31, 2024
Investment Owned, Fair Value	[1]	$ 260,014,676	$ 268,409,272
Percentage of total investments		100.00%	100.00%
ARGENTINA
Investment Owned, Fair Value	[2]	$ 15,611,783	$ 15,000,609
Percentage of total investments	[2]	6.00%	5.60%
BOTSWANA
Investment Owned, Fair Value		$ 1,777,308	$ 2,437,540
Percentage of total investments		0.70%	0.90%
BRAZIL
Investment Owned, Fair Value		$ 34,081,251	$ 33,588,599
Percentage of total investments		13.20%	12.50%
CABO VERDE
Investment Owned, Fair Value		$ 10,257,566	$ 11,809,142
Percentage of total investments		3.90%	4.40%
CAMEROON
Investment Owned, Fair Value		$ 13,986,545	$ 14,519,154
Percentage of total investments		5.40%	5.40%
CHILE
Investment Owned, Fair Value		$ 791,426	$ 970,393
Percentage of total investments		0.30%	0.40%
ECUADOR
Investment Owned, Fair Value		$ 5,008,412	$ 5,723,204
Percentage of total investments		1.90%	2.10%
HONG KONG
Investment Owned, Fair Value		$ 14,551,857	$ 15,079,739
Percentage of total investments		5.60%	5.60%
INDONESIA
Investment Owned, Fair Value		$ 12,949,836	$ 19,864,760
Percentage of total investments		5.00%	7.40%
KENYA
Investment Owned, Fair Value		$ 3,576,390	$ 3,874,961
Percentage of total investments		1.40%	1.40%
MALAYSIA
Investment Owned, Fair Value		$ 6,086,148	$ 6,531,441
Percentage of total investments		2.30%	2.40%
MEXICO
Investment Owned, Fair Value		$ 67,300,794	$ 60,511,322
Percentage of total investments		25.90%	22.50%
NAMIBIA
Investment Owned, Fair Value		$ 17,541,297	$ 16,540,160
Percentage of total investments		6.70%	6.20%
NETHERLANDS
Investment Owned, Fair Value		$ 7,857,276	$ 10,397,895
Percentage of total investments		3.00%	3.90%
NIGERIA
Investment Owned, Fair Value		$ 4,323,591	$ 6,904,599
Percentage of total investments		1.70%	2.60%
PERU
Investment Owned, Fair Value		$ 1,261,346	$ 2,261,346
Percentage of total investments		0.50%	0.80%
ROMANIA
Investment Owned, Fair Value		$ 6,982,214	$ 7,136,229
Percentage of total investments		2.70%	2.70%
SINGAPORE
Investment Owned, Fair Value		$ 19,329,240	$ 19,329,238
Percentage of total investments		7.40%	7.20%
UGANDA
Investment Owned, Fair Value		$ 13,616,136	$ 12,763,954
Percentage of total investments		5.20%	4.80%
Other Country [Member]
Investment Owned, Fair Value		$ 3,124,260	$ 3,164,987
Percentage of total investments		1.20%	1.20%

[1] Refer to Notes 2, 3 and 4 of the consolidated financial statements for additional information on the Company’s investments.

[2] All of the Company’s investments in Argentina are Participations in trade finance facilities originated by IIG TOF B.V.