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Note 3 - Segment Information - Schedule of Other Segment Disclosures (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Interest revenue (a) |  | $ 503 | $ 531 | $ 538 | $ 499 | $ 549 | $ 544 | $ 275 | $ 198 | $ 2,070 | [1] | $ 1,566 | [1]
Depreciation | [2] |  |  |  |  |  |  |  |  | 0 |  | 1 |
Amortization (b) | [2] |  |  |  |  |  |  |  |  | 21 |  | 21 |
Stock-based compensation (c) | [3] |  |  |  |  |  |  |  |  | 36 |  | 3 |
Total assets |  | 43,145 |  |  |  | 41,850 |  |  |  | 43,145 |  | 41,850 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 0 |  | 0 |
Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest revenue (a) | [1] |  |  |  |  |  |  |  |  | 843 |  | 697 |
Depreciation | [2] |  |  |  |  |  |  |  |  | 0 |  | 0 |
Amortization (b) | [2] |  |  |  |  |  |  |  |  | 0 |  | 0 |
Stock-based compensation (c) | [3] |  |  |  |  |  |  |  |  | 36 |  | 3 |
Total assets |  | 17,148 |  |  |  | 17,477 |  |  |  | 17,148 |  | 17,477 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 0 |  | 0 |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest revenue (a) | [1] |  |  |  |  |  |  |  |  | 2,070 |  | 1,566 |
Depreciation | [2] |  |  |  |  |  |  |  |  | 0 |  | 1 |
Amortization (b) | [2] |  |  |  |  |  |  |  |  | 21 |  | 21 |
Stock-based compensation (c) | [3] |  |  |  |  |  |  |  |  | 36 |  | 3 |
Total assets |  | 43,145 |  |  |  | 41,850 |  |  |  | 43,145 |  | 41,850 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 0 |  | 0 |
Operating Segments [Member] | Electronic Instruments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest revenue (a) | [1] |  |  |  |  |  |  |  |  | 0 |  | 0 |
Depreciation | [2] |  |  |  |  |  |  |  |  | 0 |  | 1 |
Amortization (b) | [2] |  |  |  |  |  |  |  |  | 21 |  | 21 |
Stock-based compensation (c) | [3] |  |  |  |  |  |  |  |  | 0 |  | 0 |
Total assets |  | 1,249 |  |  |  | 843 |  |  |  | 1,249 |  | 843 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 0 |  | 0 |
Operating Segments [Member] | Merchant Investment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest revenue (a) | [1] |  |  |  |  |  |  |  |  | 1,227 |  | 869 |
Depreciation | [2] |  |  |  |  |  |  |  |  | 0 |  | 0 |
Amortization (b) | [2] |  |  |  |  |  |  |  |  | 0 |  | 0 |
Stock-based compensation (c) | [3] |  |  |  |  |  |  |  |  | 0 |  | 0 |
Total assets |  | 24,748 |  |  |  | 23,530 |  |  |  | 24,748 |  | 23,530 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 0 |  | 0 |
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest revenue (a) | [1] |  |  |  |  |  |  |  |  | 0 |  | 0 |
Depreciation | [2] |  |  |  |  |  |  |  |  | 0 |  | 0 |
Amortization (b) | [2] |  |  |  |  |  |  |  |  | 0 |  | 0 |
Stock-based compensation (c) | [3] |  |  |  |  |  |  |  |  | 0 |  | 0 |
Total assets |  | $ 0 |  |  |  | $ 0 |  |  |  | 0 |  | 0 |
Capital expenditures |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |
[1] | Interest revenue is included in Net investment income on the Consolidated Statements of Operations.
[2] | Depreciation and Amortization are included within the other segment expense captions, such as Manufacturing cost of sales, Engineering, or Other segment items.
[3] | Stock-based compensation is included within the Compensation expense caption.

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