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Note 6 - Goodwill and Other Intangibles | 6 Months Ended
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Sep. 30, 2025
Notes to Financial Statements |
Goodwill and Intangible Assets Disclosure [Text Block] | 6. 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. The Company's goodwill balance relates to the NWL Acquisition in fiscal 2024, the acquisition of Neeltran, Inc. in fiscal 2021, the Northeast Power Systems, Inc. ("NEPSI") acquisition in fiscal 2020, and the acquisition of Infinia Technology Corporation in fiscal 2017 and is reported in the Grid business segment. 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. Goodwill increased by $4.7 million during the fiscal year ended March 31, 2025, related to the NWL Acquisition. There were no changes to Goodwill during the six months ended September 30, 2025. The Company did not identify any triggers to assess impairment in the three and six months ended September 30, 2025 or 2024. Other Intangibles Intangible assets at September 30, 2025 and March 31, 2025 consisted of the following (in thousands):
|  | September 30, 2025 |  |  | March 31, 2025 |  |  |  |  |
|  | Gross Amount |  |  | Accumulated Amortization |  |  | Net Book Value |  |  | Gross Amount |  |  | Accumulated Amortization |  |  | Net Book Value |  |  | Estimated Useful Life |
Backlog |  |  | 1,381 |  |  |  | (1,381 | ) |  |  | — |  |  |  | 1,381 |  |  |  | (1,381 | ) |  |  | — |  |  |  | 2 |
Trade name and trademarks |  |  | 1,800 |  |  |  | — |  |  |  | 1,800 |  |  |  | 1,800 |  |  |  | — |  |  |  | 1,800 |  |  | Indefinite |
Customer relationships |  |  | 10,880 |  |  |  | (8,332 | ) |  |  | 2,548 |  |  |  | 10,880 |  |  |  | (7,901 | ) |  |  | 2,980 |  |  |  | 7-10 |
Core technology and know-how |  |  | 5,970 |  |  |  | (5,076 | ) |  |  | 894 |  |  |  | 5,970 |  |  |  | (4,834 | ) |  |  | 1,136 |  |  |  | 5-10 |
Intangible assets |  | $ | 20,031 |  |  | $ | (14,789 | ) |  | $ | 5,242 |  |  | $ | 20,031 |  |  | $ | (14,116 | ) |  | $ | 5,916 |  |  |  |  |
The Company recorded intangible amortization expense related to customer relationship and core technology and know-how of $0.3 million and $0.7 million in the three and six months ended September 30, 2025, respectively. The Company recorded intangible amortization expense related to customer relationship and core technology and know-how of $0.4 million and $0.8 million in the three and six months ended September 30, 2024. Expected future amortization expense related to intangible assets is as follows (in thousands):
Years ending March 31, |  | Total |
2026 (remaining) |  |  | 674 |
2027 |  |  | 1,213 |
2028 |  |  | 671 |
2029 |  |  | 201 |
2030 |  |  | 128 |
Thereafter |  |  | 555 |
Total |  | $ | 3,442 |
The Company's intangible assets relate entirely to the Grid business segment operations in the United States.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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