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Note 3 - Segment Information - Schedule of Other Segment Disclosures (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Interest revenue (a) | [1] | $ 442 | $ 531 | $ 1,287 | $ 1,568
Amortization (b) | [2] | (27) | (11) | (16) | 0
Stock-based compensation (c) | [3] | (18) | (9) | (44) | (27)
Capital expenditures |  | 0 | 0 | 0 | 0
Corporate Segment [Member] |  |  |  |  |
Interest revenue (a) | [1] | 168 | 213 | 504 | 646
Amortization (b) | [2] | 0 | 0 | 0 | 0
Stock-based compensation (c) | [3] | (18) | (9) | (44) | (27)
Capital expenditures |  | 0 | 0 | 0 | 0
Operating Segments [Member] |  |  |  |  |
Interest revenue (a) | [1] | 442 | 531 | 1,287 | 1,568
Amortization (b) | [2] | (27) | (11) | (16) | 0
Stock-based compensation (c) | [3] | (18) | (9) | (44) | (27)
Capital expenditures |  | 0 | 0 | 0 | 0
Operating Segments [Member] | Electronic Instruments [Member] |  |  |  |  |
Interest revenue (a) | [1] | 0 | 0 | 0 | 0
Amortization (b) | [2] | (27) | (11) | (16) | 0
Stock-based compensation (c) | [3] | 0 | 0 | 0 | 0
Capital expenditures |  | 0 | 0 | 0 | 0
Operating Segments [Member] | Merchant Investment [Member] |  |  |  |  |
Interest revenue (a) | [1] | 274 | 318 | 783 | 922
Amortization (b) | [2] | 0 | 0 | 0 | 0
Stock-based compensation (c) | [3] | 0 | 0 | 0 | 0
Capital expenditures |  | 0 | 0 | 0 | 0
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] |  |  |  |  |
Interest revenue (a) | [1] | 0 | 0 | 0 | 0
Amortization (b) | [2] | 0 | 0 | 0 | 0
Stock-based compensation (c) | [3] | 0 | 0 | 0 | 0
Capital expenditures |  | $ 0 | $ 0 | $ 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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