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Note 3 - Segment Information - Schedule of Other Segment Disclosures (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Interest revenue (a) | [1] | $ 389 | $ 417
Amortization (b) | [2] | 6 | 6
Stock-based compensation (c) | [3] | 688 | 9
Capital expenditures |  | 0 | 0
Corporate Segment [Member] |  |  |
Interest revenue (a) | [1] | 166 | 170
Amortization (b) | [2] | 0 | 0
Stock-based compensation (c) | [3] | 688 | 9
Capital expenditures |  | 0 | 0
Operating Segments [Member] |  |  |
Interest revenue (a) | [1] | 389 | 417
Amortization (b) | [2] | 6 | 6
Stock-based compensation (c) | [3] | 688 | 9
Capital expenditures |  | 0 | 0
Operating Segments [Member] | Electronic Instruments [Member] |  |  |
Interest revenue (a) | [1] | 0 | 0
Amortization (b) | [2] | 6 | 6
Stock-based compensation (c) | [3] | 0 | 0
Capital expenditures |  | 0 | 0
Operating Segments [Member] | Merchant Investment [Member] |  |  |
Interest revenue (a) | [1] | 223 | 247
Amortization (b) | [2] | 0 | 0
Stock-based compensation (c) | [3] | 0 | 0
Capital expenditures |  | 0 | 0
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] |  |  |
Interest revenue (a) | [1] | 0 | 0
Amortization (b) | [2] | 0 | 0
Stock-based compensation (c) | [3] | 0 | 0
Capital expenditures |  | $ 0 | $ 0
[1] | Interest revenue is included in Net investment income on the Condensed Consolidated Statements of Operations.
[2] | Amortization is 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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