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Note 4 - Revenue Recognition - Revenues by Major Customers (Details)	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Grid [Member] | Fuji Bridex Pte Ltd [Member]
Fuji Bridex Pte Ltd	15.00%	14.00%

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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