Note 9 - Segment Information - Summary of Segment Information (Details) - USD ($)	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Revenue	$ 3,197,110	$ 2,965,406
Segment operating income	(94,024)	(819,896)
Total assets	2,127,871	2,138,728
Chemical [Member]
Revenue	1,086,707	1,101,016
Segment operating income	(132,305)	(407,230)
Total assets	700,476	791,329
Electronics [Member]
Revenue	1,526,236	1,512,692
Segment operating income	(69,029)	(371,103)
Total assets	1,038,106	1,090,751
Engineering [Member]
Revenue	584,167	351,698
Segment operating income	107,310	(41,563)
Total assets	$ 389,289	$ 256,648

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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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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