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Note 8 - Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Finite lived intangible, net |  |  | $ 2,701 |
Finite lived intangible assets, acquired |  |  | 0 |
Impairment of finite lived intangible assets |  |  | 0 |
Amortization | $ (145) | $ (178) | (272) | $ (208)
Finite lived intangible, net | 2,429 |  | 2,429 |
Indefinite lived intangible, net |  |  | 972 |
Indefinite lived intangible assets, acquired |  |  | 0 |
Impairment of indefinite lived intangible assets |  |  | 0 |
Indefinite lived intangible, net | 972 |  | 972 |
Intangible asset, net |  |  | 3,673 |
Intangible assets acquried |  |  | 0 |
Impairment of intangible assets |  |  | 0 |
Intangible asset, net | 3,401 |  | 3,401 |
IP Addresses [Member] |  |  |  |
Indefinite lived intangible, net |  |  | 392 |
Indefinite lived intangible assets, acquired |  |  | 0 |
Impairment of indefinite lived intangible assets |  |  | 0 |
Indefinite lived intangible, net | 392 |  | 392 |
CBRS FCC License [Member] |  |  |  |
Indefinite lived intangible, net |  |  | 580 |
Indefinite lived intangible assets, acquired |  |  | 0 |
Impairment of indefinite lived intangible assets |  |  | 0 |
Indefinite lived intangible, net | $ 580 |  | $ 580 |
Subscription Relationships [Member] |  |  |  |
Weighted average remaining amortization period (Year) | 3 years 8 months 26 days |  | 3 years 8 months 26 days |
Finite lived intangible, net |  |  | $ 2,234 |
Finite lived intangible assets, acquired |  |  | 0 |
Impairment of finite lived intangible assets |  |  | 0 |
Amortization |  |  | (247) |
Finite lived intangible, net | $ 1,987 |  | $ 1,987 |
Trade Names [Member] |  |  |  |
Weighted average remaining amortization period (Year) | 8 years 8 months 1 day |  | 8 years 8 months 1 day |
Finite lived intangible, net |  |  | $ 467 |
Finite lived intangible assets, acquired |  |  | 0 |
Impairment of finite lived intangible assets |  |  | 0 |
Amortization |  |  | (25) |
Finite lived intangible, net | $ 442 |  | $ 442 |

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