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Note 3 - Revenue Recognition - Revenues by Major Customers (Details) - Revenue Benchmark [Member] - Customer Concentration Risk [Member]	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Inox Wind Limited [Member] | Wind [Member]
Concentration risk percentage		24.00%		12.00%
Fuji Bridex Pte Ltd [Member] | Grid [Member]
Concentration risk percentage	20.00%		10.00%
EPC Services Company [Member] | Grid [Member]
Concentration risk percentage		14.00%		17.00%

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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