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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, 2021	Mar. 31, 2020
EPC Services Company [Member]
Concentration risk percentage	13.00%	0.00%
Department of Homeland Security [Member]
Concentration risk percentage	10.00%	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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