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Note 5 - Transactions With Affiliated Companies - Investments in Controlled Affiliated Companies (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Net unrealized (depreciation) appreciation on investments |  | $ 3,442 | $ 3,376 | $ 1,169 | $ 8,122 |
Net realized (loss) gain on investments |  | (8,585) | $ 1,344 | (9,484) | (2,372) |
HESP LLC [Member] |  |  |  |  |  |
Fair value |  |  |  | 0 | 1,500 | $ 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 |  | 0
Dividend income |  |  |  | 0 |  | 0
Dividends declared |  |  |  | 0 |  | 0
Controlled Affiliate [Member] |  |  |  |  |  |
Fair value |  |  |  | 0 | 1,500 | 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 |  | 0
Dividend income |  |  |  | 0 |  | 0
Dividends declared |  |  |  | 0 |  | 0
Other Affiliates [Member] |  |  |  |  |  |
Fair value |  |  |  | 0 | 7,547 | 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
Dividend income |  |  |  |  |  | 252
Other Affiliates [Member] | First Decisyon Inc. Investment [Member] |  |  |  |  |  |
Fair value | [1] |  |  | 0 | 1,181 | 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
Dividend income | [1] |  |  |  |  | 41
Other Affiliates [Member] | Second Decisyon Inc. Investment [Member] |  |  |  |  |  |
Fair value | [1] |  |  | 0 | 626 | 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
Dividend income | [1] |  |  |  |  | 21
Other Affiliates [Member] | Third Decisyon Inc. Investment [Member] |  |  |  |  |  |
Fair value | [1] |  |  | 0 | 227 | 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
Dividend income | [1] |  |  |  |  | 7
Other Affiliates [Member] | Fourth Decisyon Inc. Investment [Member] |  |  |  |  |  |
Fair value | [1] |  |  | 0 | 228 | 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
Dividend income | [1] |  |  |  |  | 7
Other Affiliates [Member] | Fifth Decisyon Inc. Investment [Member] |  |  |  |  |  |
Fair value | [1] |  |  | 0 | 685 | 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
Dividend income | [1] |  |  |  |  | 22
Other Affiliates [Member] | Sixth Decisyon Inc. Investment [Member] |  |  |  |  |  |
Fair value | [1] |  |  | 0 | 276 | 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
Dividend income | [1] |  |  |  |  | 9
Other Affiliates [Member] | Seventh Decisyon Inc. Investment [Member] |  |  |  |  |  |
Fair value | [1] |  |  | 0 | 183 | 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
Dividend income | [1] |  |  |  |  | 6
Other Affiliates [Member] | Eighth Decisyon Inc. Investment [Member] |  |  |  |  |  |
Fair value | [1] |  |  | 0 | 120 | 120
Purchases | [1] |  |  |  |  | 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
Dividend income | [1] |  |  |  |  | 0
Other Affiliates [Member] | First MVI (ABC) LLC fka StereoVision, Inc. Investment [Member] |  |  |  |  |  |
Fair value |  |  |  | 0 | 2,382 | 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
Dividend income |  |  |  |  |  | 139
Other Affiliates [Member] | Second MVI (ABC) LLC fka StereoVision, Inc. Investment [Member] |  |  |  |  |  |
Fair value |  |  |  | 0 | 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
Dividend income |  |  |  |  |  | 0
Other Affiliates [Member] | Third MVI (ABC) LLC fka StereoVision, Inc. Investment [Member] |  |  |  |  |  |
Fair value |  |  |  | 0 | 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
Dividend income |  |  |  |  |  | 0
Other Affiliates [Member] | Fourth MVI (ABC) LLC fka StereoVision, Inc. Investment [Member] |  |  |  |  |  |
Fair value |  |  |  | 0 | 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
Dividend income |  |  |  |  |  | 0
Other Affiliates [Member] | Fifth MVI (ABC) LLC fka StereoVision, Inc. Investment [Member] |  |  |  |  |  |
Fair value |  |  |  | 0 | 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
Dividend income |  |  |  |  |  | 0
Other Affiliates [Member] | Sixth MVI (ABC) LLC fka StereoVision, Inc. Investment [Member] |  |  |  |  |  |
Fair value |  |  |  | $ 0 | $ 1,639 | 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
Dividend income |  |  |  |  |  | $ 0
[1] | As of December 31, 2021, the Company no longer owns 5% or more of the portfolio company.

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