Note 9 - Segment Information - Summary of Segment Information (Details) - USD ($)	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Revenue	$ 3,347,082	$ 3,197,110
Segment operating income	(159,097)	(94,024)
Total assets	1,826,512	2,127,871
Chemical [Member]
Revenue	1,159,583	1,086,707
Segment operating income	(177,969)	(132,305)
Total assets	630,004	700,476
Electronics [Member]
Revenue	1,838,152	1,526,236
Segment operating income	(10,717)	(69,029)
Total assets	1,005,424	1,038,106
Engineering [Member]
Revenue	349,347	584,167
Segment operating income	29,589	107,310
Total assets	$ 191,084	$ 389,289

Amount of asset recognized for present right to economic benefit.

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+ Details

- Definition

The net result for the period of deducting operating expenses from operating revenues.

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+ Details

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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