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Note 8 - Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Sep. 30, 2025
Notes Tables |
Schedule of Goodwill [Table Text Block] |
(In thousands) |  | Net Carrying Amount as of March 31, 2025 |  |  | Additions |  |  | Impairment |  |  | Net Carrying Amount as of September 30, 2025 |
Goodwill |  | $ | 12,280 |  |  | $ | - |  |  | $ | - |  |  |  | 12,280 |
|  | $ | 12,280 |  |  | $ | - |  |  | $ | - |  |  | $ | 12,280 |
Schedule of Intangible Assets [Table Text Block] |
(In thousands) |  | Weighted Average Remaining Amortization Period (Years) |  |  | Net Carrying Amount as of March 31, 2025 |  |  | Additions |  |  | Impairment |  |  | Amortization |  |  | Net Carrying Amount as of September 30, 2025 |
Definite lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subscriber relationships |  |  | 3.74 |  |  | $ | 2,234 |  |  | $ | - |  |  | $ | - |  |  | $ | (247 | ) |  | $ | 1,987 |
Trade name |  |  | 8.67 |  |  |  | 467 |  |  |  | - |  |  |  | - |  |  |  | (25 | ) |  |  | 442 |
|  |  |  |  |  |  | 2,701 |  |  |  | - |  |  |  | - |  |  |  | (272 | ) |  |  | 2,429 |
Indefinite lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IP Addresses |  |  | N/A |  |  |  | 392 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 392 |
FCC Spectrum license |  |  | N/A |  |  |  | 580 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 580 |
|  |  |  |  |  |  | 972 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 972 |
|  |  |  |  |  | $ | 3,673 |  |  | $ | - |  |  | $ | - |  |  | $ | (272 | ) |  | $ | 3,401 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
(In thousands) |  |  |  |
Remainder of FY 2026 |  | $ | 290 |
FY 2027 |  |  | 582 |
FY 2028 |  |  | 582 |
FY 2029 |  |  | 582 |
FY 2030 |  |  | 180 |
Thereafter |  |  | 213 |
Total |  | $ | 2,429 |

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