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Note 4 - Revenue Recognition - Revenues by Major Customers (Details) - Revenue Benchmark [Member] - Customer Concentration Risk [Member] - Grid [Member]	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
EPC Services Company [Member]
Concentration risk percentage		13.00%
Fuji Bridex Pte Ltd [Member]
Concentration risk percentage	14.00%

X

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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