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Segment Information - Schedule of Revenue from Contracts with Customers, Profitability Information and Asset Information by Segment and Geographical Areas (Details) - USD ($)
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Metal Stamping and Mechanical OEM [Member]      
Segment Reporting Information [Line Items]      
Total revenue $ 4,500,000 $ 3,474,000 $ 6,654,000
Cost 3,077,000 2,719,000 4,956,000
Gross Profit 1,423,000 755,000 1,698,000
Selling, general and administrative expenses 1,749,000 1,158,000 1,910,000
Impairment of property, plant and equipment 190,000
Impairment of operating lease right of use assets 302,000
Total operating expenses 1,749,000 1,650,000 1,910
Segment loss (326,000) (895,000) (212,000)
Depreciation expense 6,000 89,000 137,000
Capital expenditure 62,000 65,000 60,000
Metal Stamping and Mechanical OEM [Member] | Sales of products [Member]      
Segment Reporting Information [Line Items]      
Total revenue 4,500,000 3,474,000 6,654,000
Metal Stamping and Mechanical OEM [Member] | Sub-contracting income [Member]      
Segment Reporting Information [Line Items]      
Total revenue
Electric OEM [Member]      
Segment Reporting Information [Line Items]      
Total revenue 2,912,000 2,847,000 3,588,000
Cost 1,865,000 1,894,000 2,145,000
Gross Profit 1,047,000 953,000 1,443,000
Selling, general and administrative expenses 1,149,000 1,210,000 1,538,000
Impairment of property, plant and equipment 145,000
Impairment of operating lease right of use assets 225,000
Total operating expenses 1,149,000 1,580,000 1,538,000
Segment loss (102,000) (627,000) (95,000)
Depreciation expense 3,000 70,000 72,000
Capital expenditure 39,000 53,000 32,000
Electric OEM [Member] | Sales of products [Member]      
Segment Reporting Information [Line Items]      
Total revenue 2,912,000 2,029,000 3,588,000
Electric OEM [Member] | Sub-contracting income [Member]      
Segment Reporting Information [Line Items]      
Total revenue 818,000
Corporate [Member]      
Segment Reporting Information [Line Items]      
Total revenue
Cost
Gross Profit
Selling, general and administrative expenses 107,000 109,000 170,000
Impairment of property, plant and equipment
Impairment of operating lease right of use assets
Total operating expenses 107,000 109,000 170,000
Segment loss (107,000) (109,000) (170,000)
Depreciation expense
Capital expenditure
Corporate [Member] | Sales of products [Member]      
Segment Reporting Information [Line Items]      
Total revenue
Corporate [Member] | Sub-contracting income [Member]      
Segment Reporting Information [Line Items]      
Total revenue
Consolidated [Member]      
Segment Reporting Information [Line Items]      
Total revenue 7,412,000 6,321,000 10,242,000
Cost 4,942,000 4,613,000 7,101,000
Gross Profit 2,470,000 1,708,000 3,141,000
Selling, general and administrative expenses 3,005,000 2,477,000 3,618,000
Impairment of property, plant and equipment 335,000
Impairment of operating lease right of use assets 527,000
Total operating expenses 3,005,000 3,339,000 3,618,000
Segment loss (535,000) (1,631,000) (477,000)
Exchange gain, net 124,000 198,000 32,000
Interest income 203,000 248,000 87,000
Other income 22,000 30,000 38,000
Gain on disposal of property, plant and equipment 333,000 16,000 7,000
Income before income taxes 147,000 (1,139,000) (313,000)
Depreciation expense 9,000 159,000 209,000
Capital expenditure 101,000 118,000 92,000
Consolidated [Member] | Sales of products [Member]      
Segment Reporting Information [Line Items]      
Total revenue 7,412,000 5,503,000 10,242,000
Consolidated [Member] | Sub-contracting income [Member]      
Segment Reporting Information [Line Items]      
Total revenue $ 818,000