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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Grid [Member] | EPC Services Company [Member]
Concentration risk percentage	12.00%	0.00%	18.00%	0.00%
Grid [Member] | Hoffman Construction [Member]
Concentration risk percentage	10.00%	25.00%	10.00%	12.00%
Grid [Member] | M.J. Electric, LLC [Member]
Concentration risk percentage	10.00%	25.00%	10.00%	13.00%
Grid [Member] | Micron Technology [Member]
Concentration risk percentage	10.00%	10.00%	10.00%	14.00%
Grid [Member] | Reed & Reed Inc. [Member]
Concentration risk percentage	25.00%	0.00%	12.00%	0.00%
Grid [Member] | Siemens Gamesa Renewable Energy [Member]
Concentration risk percentage	10.00%	0.00%	13.00%	0.00%
Wind [Member] | Inox Wind Limited [Member]
Concentration risk percentage	10.00%	10.00%	10.00%	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

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