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Note 14 - Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Total revenue | $ 3,159 | $ 2,958 | $ 6,193 | $ 3,447
General and administrative | 2,208 | 2,811 | 4,441 | 6,602
Depreciation and amortization | 864 | 481 | 1,472 | 572
Plant specific operations | 362 | 324 | 789 | 398
Plant nonspecific operations | 247 | 227 | 474 | 265
Advertising and marketing | 89 | 12 | 242 | 12
Total segment operating expenses | 4,122 | 4,221 | 8,142 | 8,281
Telecommunications segment operating income (loss) | (963) | (1,263) | (1,949) | (4,834)
Interest income, net | 148 | 395 | 363 | 806
Loss on dissenting shareholders' liability | 0 | (274) | 0 | (1,103)
Other income expense | 21 | 10 | 37 | 10
Consolidated net loss before income taxes and discontinued operations | (789) | (1,102) | (1,528) | (6,802)
Wireless Internet Services [Member] |  |  |  |
Total revenue | 1,666 | 1,764 | 3,338 | 2,083
Fiber Internet Services [Member] |  |  |  |
Total revenue | 1,016 | 773 | 1,946 | 879
Product and Service, Other [Member] |  |  |  |
Total revenue | 477 | 421 | 909 | 485
Cost of other revenue (exclusive of depreciation shown separately) | 177 | 209 | 353 | 245
Wireless and Fiber Internet Service [Member] |  |  |  |
Cost of other revenue (exclusive of depreciation shown separately) | 175 | 157 | 371 | 187
Operating Segments [Member] |  |  |  |
Total revenue | 3,159 | 2,958 | 6,193 | 3,447
General and administrative | 1,252 | 1,134 | 2,479 | 1,965
Depreciation and amortization | 829 | 465 | 1,401 | 545
Plant specific operations | 363 | 324 | 790 | 398
Plant nonspecific operations | 247 | 227 | 474 | 265
Advertising and marketing | 85 | 0 | 229 | 0
Total segment operating expenses | 3,128 | 2,516 | 6,097 | 3,605
Telecommunications segment operating income (loss) | 31 | 442 | 96 | (158)
Interest income, net | 30 | 472 | 123 | (128)
Operating Segments [Member] | Wireless Internet Services [Member] |  |  |  |
Total revenue | 1,666 | 1,764 | 3,338 | 2,083
Operating Segments [Member] | Fiber Internet Services [Member] |  |  |  |
Total revenue | 1,016 | 773 | 1,946 | 879
Operating Segments [Member] | Product and Service, Other [Member] |  |  |  |
Total revenue | 477 | 421 | 909 | 485
Cost of other revenue (exclusive of depreciation shown separately) | 177 | 209 | 353 | 245
Operating Segments [Member] | Wireless and Fiber Internet Service [Member] |  |  |  |
Cost of other revenue (exclusive of depreciation shown separately) | 175 | 157 | 371 | 187
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |  |  |
General and administrative | (956) | (1,677) | (1,962) | (4,637)
Depreciation and amortization | (35) | (16) | (71) | (27)
Advertising and marketing | (4) | (12) | (13) | (12)
Emigration tax (expense) | 0 | 0 | 0 | (1,711)
Loss on dissenting shareholders' liability | 0 | (274) | 0 | (1,103)
Other income expense | $ 0 | $ 10 | $ 0 | $ 10

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