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Note 5 - Goodwill and Other Intangibles | 3 Months Ended
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Jun. 30, 2023
Notes to Financial Statements |
Goodwill and Intangible Assets Disclosure [Text Block] | 5. Goodwill and Other Intangibles Goodwill Goodwill represents the difference between the purchase price and the fair value of the identifiable tangible and intangible net assets when accounted for using the purchase method of accounting. Goodwill is not amortized but reviewed for impairment. Goodwill is reviewed annually on February 28th and whenever events or changes in circumstances indicate that the carrying value of the goodwill might not be recoverable. There were no changes to goodwill during the three months ended June 30, 2023 or year ended March 31, 2023. The Company did not identify any triggering events in the three months ended June 30, 2023 that would require interim impairment testing of goodwill. Other Intangibles Intangible assets at June 30, 2023 and March 31, 2023 consisted of the following (in thousands):
|  | June 30, 2023 |  |  | March 31, 2023 |  |  |  |  |
|  | Gross Amount |  |  | Accumulated Amortization |  |  | Net Book Value |  |  | Gross Amount |  |  | Accumulated Amortization |  |  | Net Book Value |  |  | Estimated Useful Life |
Licenses |  | $ | 3,610 |  |  | $ | (3,610 | ) |  | $ | — |  |  | $ | 3,610 |  |  | $ | (3,610 | ) |  | $ | — |  |  |  | 7 |
Backlog |  |  | 681 |  |  |  | (681 | ) |  |  | — |  |  |  | 681 |  |  |  | (675 | ) |  | $ | 6 |  |  |  | 2 |
Trade name and trademarks |  |  | 1,800 |  |  |  | — |  |  |  | 1,800 |  |  |  | 1,800 |  |  |  | — |  |  |  | 1,800 |  |  |  | Indefinite |
Customer relationships |  |  | 9,600 |  |  |  | (5,397 | ) |  |  | 4,203 |  |  |  | 9,600 |  |  |  | (4,980 | ) |  |  | 4,620 |  |  |  | 7 |
Core technology and know-how |  |  | 5,970 |  |  |  | (3,990 | ) |  |  | 1,980 |  |  |  | 5,970 |  |  |  | (3,869 | ) |  |  | 2,101 |  |  |  | 5-10 |
Intangible assets |  | $ | 21,661 |  |  | $ | (13,678 | ) |  | $ | 7,983 |  |  | $ | 21,661 |  |  | $ | (13,134 | ) |  | $ | 8,527 |  |  |  |  |
The Company recorded intangible amortization expense related to customer relationship and core technology and know-how of $0.5 million and $0.7 million, in the three months ended June 30, 2023 and 2022 respectively. Additionally, the Company recorded intangible amortization related to backlog that is reported in cost of revenues of less than $0.1 million in each of the three months ended June 30, 2023 and 2022. Expected future amortization expense related to intangible assets is as follows (in thousands):
Years ended March 31, |  | Total |
2024 |  |  | 1,614 |
2025 |  |  | 1,648 |
2026 |  |  | 1,221 |
2027 |  |  | 1,085 |
2028 |  |  | 543 |
Thereafter |  |  | 72 |
Total |  | $ | 6,183 |
The Company's intangible assets relate entirely to the Grid business segment operations in the United States.

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