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Note 10 - Intangible Assets | 12 Months Ended
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Mar. 31, 2022
Notes to Financial Statements |
Intangible Assets Disclosure [Text Block] | 10. Intangible Assets Intangible assets at March 31, 2022 and 2021 consisted of the following (in thousands):
|  | 2022 |  |  | 2021 |  |  |  |
|  | 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 |  |  |  | (631 | ) |  |  | 50 |  |  |  | 600 |  |  |  | (475 | ) |  |  | 125 |  |  | 2 |
Trade names and trademarks |  |  | 1,800 |  |  |  | - |  |  |  | 1,800 |  |  |  | 600 |  |  |  | - |  |  |  | 600 |  |  | Indefinite |
Customer relationships |  |  | 9,600 |  |  |  | (2,723 | ) |  |  | 6,877 |  |  |  | 6,100 |  |  |  | (739 | ) |  |  | 5,361 |  |  | 7 |
Core technology and know-how |  |  | 5,970 |  |  |  | (3,386 | ) |  |  | 2,584 |  |  |  | 5,970 |  |  |  | (2,903 | ) |  |  | 3,067 |  |  | 5-10 |
Intangible assets |  | $ | 21,661 |  |  | $ | (10,350 | ) |  | $ | 11,311 |  |  | $ | 16,880 |  |  | $ | (7,727 | ) |  | $ | 9,153 |  |  |  |
The Company recorded intangible amortization expense of $2.5 million and $1.2 million, for the fiscal years ended March 31, 2022, and 2021, respectively. Additionally, in the fiscal year ended March 31, 2022, the Company recorded $0.2 and $0.5 million related to intangible amortization related to backlog that is reported in cost of revenues for the fiscal years ended March 31, 2022, and 2021, respectively. Expected future amortization expense related to intangible assets is as follows (in thousands):
Fiscal years ending March 31, |  | Total |
2023 |  | $ | 2,803 |
2024 |  |  | 2,152 |
2025 |  |  | 1,648 |
2026 |  |  | 1,221 |
2027 |  |  | 1,085 |
Thereafter |  |  | 602 |
Total |  | $ | 9,511 |
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 all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -URI https://asc.fasb.org/subtopic&trid=2144471 + Details
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