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Note 10 - Intangible Assets | 12 Months Ended
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Mar. 31, 2024
Notes to Financial Statements |
Intangible Assets Disclosure [Text Block] | 10. Intangible Assets Intangible assets at March 31, 2024 and 2023 consisted of the following (in thousands):
|  | 2024 |  |  | 2023 |  |  |  |  |
|  | Gross Amount |  |  | Accumulated Amortization |  |  | Net Book Value |  |  | Gross Amount |  |  | Accumulated Amortization |  |  | Net Book Value |  |  | Estimated Useful Life |
Backlog |  |  | 681 |  |  |  | (681 | ) |  |  | — |  |  |  | 681 |  |  |  | (675 | ) |  |  | 6 |  |  |  | 2 |
Trade names and trademarks |  |  | 1,800 |  |  |  | — |  |  |  | 1,800 |  |  |  | 1,800 |  |  |  | — |  |  |  | 1,800 |  |  |  | Indefinite |
Customer relationships |  |  | 9,600 |  |  |  | (6,649 | ) |  |  | 2,951 |  |  |  | 9,600 |  |  |  | (4,980 | ) |  |  | 4,620 |  |  |  | 7 |
Core technology and know-how |  |  | 5,970 |  |  |  | (4,352 | ) |  |  | 1,618 |  |  |  | 5,970 |  |  |  | (3,869 | ) |  |  | 2,101 |  |  |  | 5-10 |
Intangible assets |  | $ | 18,051 |  |  | $ | (11,682 | ) |  | $ | 6,369 |  |  | $ | 18,051 |  |  | $ | (9,524 | ) |  | $ | 8,527 |  |  |  |  |
The Company recorded intangible amortization expense of $2.2 million and $2.8 million, for the fiscal years ended March 31, 2024 and 2023, respectively. Additionally, the Company recorded less than $0.1 million related to intangible amortization related to backlog that is reported in cost of revenues for both the fiscal years ended March 31, 2024 and 2023. Expected future amortization expense related to intangible assets is as follows (in thousands):
Fiscal years ending March 31, |  | Total |
2025 |  | $ | 1,648 |
2026 |  |  | 1,221 |
2027 |  |  | 1,085 |
2028 |  |  | 543 |
2029 |  |  | 72 |
Total |  | $ | 4,569 |
The Company's intangible assets relate entirely to the Grid business segment operations in the United States.

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