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Note 3 - Revenue Recognition - Revenues By Major Customers (Details) - Customer Concentration Risk [Member] - Revenue Benchmark [Member]	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Wind [Member] | Inox Wind Limited [Member]
Concentration risk percentage	24.00%	10.00%	12.00%	11.00%
Grid [Member] | Department of Homeland Security [Member]
Concentration risk percentage	10.00%	22.00%	10.00%	12.00%
Grid [Member] | Vestas [Member]
Concentration risk percentage	10.00%	25.00%	10.00%	10.00%
Grid [Member] | EPC Services Company [Member]
Concentration risk percentage	14.00%	10.00%	17.00%	10.00%

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

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