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Note 2 - Revenue Recognition - Revenues By Major Customers (Details) - Customer Concentration Risk [Member] - Revenue Benchmark [Member]	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Wind [Member] | Inox Wind Limited [Member]
Concentration risk percentage	10.00%	27.00%
Grid [Member] | Micron Technology [Member]
Concentration risk percentage	0.00%	25.00%
Grid [Member] | Siemens Gamesa Renewable Energy [Member]
Concentration risk percentage	25.00%	0.00%
Grid [Member] | EPC Services Company [Member]
Concentration risk percentage	24.00%	0.00%

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
-Publisher FASB
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-Publisher FASB
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-Topic 275
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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