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Note 5 - Transactions With Affiliated Companies - Investments in Controlled Affiliated Companies (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net unrealized (depreciation) appreciation on investments		$ (5,552)	$ 3,205	$ 313
Net realized (loss) gain on investments		(9,484)	(3,248)	(14,698)
HESP LLC [Member]
Fair value		0	1,500
Purchases		0	0
Reductions		(300)	(50)
Transfers		0	0
Net unrealized (depreciation) appreciation on investments		1,450	(1,450)
Net realized (loss) gain on investments		(1,150)	0
Fair value		0	0	1,500
Interest income		0	0
Dividends declared		0	0
Controlled Affiliate [Member]
Fair value		0	1,500
Purchases		0	0
Reductions		(300)	(50)
Transfers		0	0
Net unrealized (depreciation) appreciation on investments		1,450	(1,450)
Net realized (loss) gain on investments		(1,150)	0
Fair value		0	0	1,500
Interest income		0	0
Dividends declared		0	0
Other Affiliates [Member]
Fair value		0	7,547
Purchases			800
Reductions			(3,583)
Transfers			(3,538)
Discount accretion			12
Net unrealized (depreciation) appreciation on investments			(848)
Net realized (loss) gain on investments			(390)
Fair value			0	7,547
Interest income			252
Other Affiliates [Member] | First Decisyon Inc. Investment [Member]
Fair value	[1]	0	1,181
Purchases	[1]		0
Reductions	[1]		0
Transfers	[1]		(1,181)
Discount accretion	[1]		0
Net unrealized (depreciation) appreciation on investments	[1]		0
Net realized (loss) gain on investments	[1]		0
Fair value	[1]		0	1,181
Interest income	[1]		41
Other Affiliates [Member] | Second Decisyon Inc. Investment [Member]
Fair value	[1]	0	626
Purchases	[1]		0
Reductions	[1]		0
Transfers	[1]		(638)
Discount accretion	[1]		12
Net unrealized (depreciation) appreciation on investments	[1]		0
Net realized (loss) gain on investments	[1]		0
Fair value	[1]		0	626
Interest income	[1]		21
Other Affiliates [Member] | Third Decisyon Inc. Investment [Member]
Fair value	[1]	0	227
Purchases	[1]		0
Reductions	[1]		0
Transfers	[1]		(227)
Discount accretion	[1]		0
Net unrealized (depreciation) appreciation on investments	[1]		0
Net realized (loss) gain on investments	[1]		0
Fair value	[1]		0	227
Interest income	[1]		7
Other Affiliates [Member] | Fourth Decisyon Inc. Investment [Member]
Fair value	[1]	0	228
Purchases	[1]		0
Reductions	[1]		0
Transfers	[1]		(228)
Discount accretion	[1]		0
Net unrealized (depreciation) appreciation on investments	[1]		0
Net realized (loss) gain on investments	[1]		0
Fair value	[1]		0	228
Interest income	[1]		7
Other Affiliates [Member] | Fifth Decisyon Inc. Investment [Member]
Fair value	[1]	0	685
Purchases	[1]		0
Reductions	[1]		0
Transfers	[1]		(685)
Discount accretion	[1]		0
Net unrealized (depreciation) appreciation on investments	[1]		0
Net realized (loss) gain on investments	[1]		0
Fair value	[1]		0	685
Interest income	[1]		22
Other Affiliates [Member] | Sixth Decisyon Inc. Investment [Member]
Fair value	[1]	0	276
Purchases	[1]		0
Reductions	[1]		0
Transfers	[1]		(276)
Discount accretion	[1]		0
Net unrealized (depreciation) appreciation on investments	[1]		0
Net realized (loss) gain on investments	[1]		0
Fair value	[1]		0	276
Interest income	[1]		9
Other Affiliates [Member] | Seventh Decisyon Inc. Investment [Member]
Fair value	[1]	0	183
Purchases	[1]		0
Reductions	[1]		0
Transfers	[1]		(183)
Discount accretion	[1]		0
Net unrealized (depreciation) appreciation on investments	[1]		0
Net realized (loss) gain on investments	[1]		0
Fair value	[1]		0	183
Interest income	[1]		6
Other Affiliates [Member] | Eighth Decisyon Inc. Investment [Member]
Fair value	[1]	0	120
Purchases			0
Reductions	[1]		0
Transfers	[1]		(120)
Discount accretion	[1]		0
Net unrealized (depreciation) appreciation on investments	[1]		0
Net realized (loss) gain on investments	[1]		0
Fair value	[1]		0	120
Interest income	[1]		0
Other Affiliates [Member] | First MVI (ABC) LLC fka StereoVision, Inc. Investment [Member]
Fair value		0	2,382
Purchases			0
Reductions			(2,783)
Transfers			0
Discount accretion			0
Net unrealized (depreciation) appreciation on investments			0
Net realized (loss) gain on investments			401
Fair value			0	2,382
Interest income			139
Other Affiliates [Member] | Second MVI (ABC) LLC fka StereoVision, Inc. Investment [Member]
Fair value		0	0
Purchases			250
Reductions			(250)
Transfers			0
Discount accretion			0
Net unrealized (depreciation) appreciation on investments			0
Net realized (loss) gain on investments			0
Fair value			0	0
Interest income			0
Other Affiliates [Member] | Third MVI (ABC) LLC fka StereoVision, Inc. Investment [Member]
Fair value		0	0
Purchases			70
Reductions			(70)
Transfers			0
Discount accretion			0
Net unrealized (depreciation) appreciation on investments			0
Net realized (loss) gain on investments			0
Fair value			0	0
Interest income			0
Other Affiliates [Member] | Fourth MVI (ABC) LLC fka StereoVision, Inc. Investment [Member]
Fair value		0	0
Purchases			330
Reductions			(330)
Transfers			0
Discount accretion			0
Net unrealized (depreciation) appreciation on investments			0
Net realized (loss) gain on investments
Fair value			0	0
Interest income			0
Other Affiliates [Member] | Fifth MVI (ABC) LLC fka StereoVision, Inc. Investment [Member]
Fair value		0	0
Purchases			150
Reductions			(150)
Transfers			0
Discount accretion			0
Net unrealized (depreciation) appreciation on investments			0
Net realized (loss) gain on investments			0
Fair value			0	0
Interest income			0
Other Affiliates [Member] | Sixth MVI (ABC) LLC fka StereoVision, Inc. Investment [Member]
Fair value		$ 0	1,639
Purchases			0
Reductions			0
Transfers			0
Discount accretion			0
Net unrealized (depreciation) appreciation on investments			(848)
Net realized (loss) gain on investments			(791)
Fair value			0	$ 1,639
Interest income			$ 0
[1] As of December 31, 2021 the Company no longer owns 5% or more of the portfolio company.

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+ References

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