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Note 2 - Revenue Recognition - Revenues by Major Customers (Details) - Revenue Benchmark [Member] - Customer Concentration Risk [Member]	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Inox Wind Limited [Member] | Wind [Member]
Concentration of risk, revenue	12.00%		12.00%
Fuji Bridex Pte Ltd [Member] | Grid [Member]
Concentration of risk, revenue		17.00%		13.00%
Gray Construction, Inc. [Member] | Grid [Member]
Concentration of risk, revenue	11.00%
Ascend Performance Materials Ops LLC [Member] | Grid [Member]
Concentration of risk, revenue		12.00%

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
-Topic 280
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