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Note 3 - Segment Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Net sales |  | $ (491) | $ (531) | $ (989) | $ (923)
Net investment income |  | (428) | (538) | (845) | (1,037)
Net gains (losses) |  | 5 | (1) | 8 | (4)
Total revenues |  | 924 | 1,068 | 1,842 | 1,956
Manufacturing cost of sales |  | 211 | 214 | 448 | 418
Engineering |  | 57 | 48 | 114 | 87
Commissions |  | 21 | 36 | 40 | 55
Sales and marketing |  | 35 | 47 | 92 | 80
Accounting |  | 50 | 32 | 125 | 188
Compensation |  | 209 | 208 | 457 | 396
Corporation allocations (a) | [1] | 0 | 0 | 0 | 0
Other segment items (b) | [2] | 372 | 246 | 556 | 416
Engineering, selling and administrative |  | 744 | 617 | 1,384 | 1,222
Total expenses |  | 955 | 831 | 1,832 | 1,640
Segment profit (loss) |  | (31) | 237 | 10 | 316
Loss from operations before income taxes |  | (31) | 237 | 10 | 316
Loss from operations before income taxes |  | (31) | 237 | 10 | 316
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |  |  |  |
Net sales |  | 0 | 0 | 0 | 0
Net investment income |  | (166) | (223) | (336) | (433)
Net gains (losses) |  | 5 | (1) | 8 | (4)
Total revenues |  | 171 | 222 | 344 | 429
Manufacturing cost of sales |  | 0 | 0 | 0 | 0
Engineering |  | 0 | 0 | 0 | 0
Commissions |  | 0 | 0 | 0 | 0
Sales and marketing |  | 0 | 0 | 0 | 0
Accounting |  | 50 | 32 | 125 | 188
Compensation |  | 157 | 146 | 349 | 276
Corporation allocations (a) | [1] | (104) | (87) | (208) | (145)
Other segment items (b) | [2] | 315 | 205 | 456 | 347
Engineering, selling and administrative |  | 418 | 296 | 722 | 666
Total expenses |  | 418 | 296 | 722 | 666
Segment profit (loss) |  | (247) | (74) | (378) | (237)
Electronic Instruments [Member] | Operating Segments [Member] |  |  |  |  |
Net sales |  | (491) | (531) | (989) | (923)
Net investment income |  | 0 | 0 | 0 | 0
Net gains (losses) |  | 0 | 0 | 0 | 0
Total revenues |  | 491 | 531 | 989 | 923
Manufacturing cost of sales |  | 211 | 214 | 448 | 418
Engineering |  | 57 | 48 | 114 | 87
Commissions |  | 21 | 36 | 40 | 55
Sales and marketing |  | 35 | 47 | 92 | 80
Accounting |  | 0 | 0 | 0 | 0
Compensation |  | 52 | 62 | 108 | 120
Corporation allocations (a) | [1] | 11 | 10 | 22 | 19
Other segment items (b) | [2] | 36 | 40 | 78 | 68
Engineering, selling and administrative |  | 212 | 243 | 454 | 429
Total expenses |  | 423 | 457 | 902 | 847
Segment profit (loss) |  | 68 | 74 | 87 | 76
Merchant Investment [Member] | Operating Segments [Member] |  |  |  |  |
Net sales |  | 0 | 0 | 0 | 0
Net investment income |  | (262) | (315) | (509) | (604)
Net gains (losses) |  | 0 | 0 | 0 | 0
Total revenues |  | 262 | 315 | 509 | 604
Manufacturing cost of sales |  | 0 | 0 | 0 | 0
Engineering |  | 0 | 0 |  | 0
Commissions |  | 0 | 0 |  | 0
Sales and marketing |  | 0 | 0 |  | 0
Accounting |  | 0 | 0 |  | 0
Compensation |  | 0 | 0 |  | 0
Corporation allocations (a) | [1] | 93 | 77 | 186 | 126
Other segment items (b) | [2] | 21 | 1 | 22 | 1
Engineering, selling and administrative |  | 114 | 78 | 208 | 127
Total expenses |  | 114 | 78 | 208 | 127
Segment profit (loss) |  | $ 148 | $ 237 | $ 301 | $ 477
[1] | The Electronic Instruments and Merchant Investment segments are allocated overhead expenses from the Corporate segment based on each segment's asset as a percentage of Total assets.
[2] | Other segment items for each reportable segment includes the following: Electronic Instruments - rent, amortization, professional service fees, and certain other overhead expenses. Merchant Investment - legal expense and certain other overhead expenses. Corporate - legal expense, insurance expense, filing fees, fees paid to MtronPTI under Amended and Restated Transitional Administrative and Management Services agreement, and certain other overhead expenses.

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