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Note 3 - Revenue Recognition - Revenues By Major Customers (Details) - Revenue Benchmark [Member] - Customer Concentration Risk [Member] - Grid [Member]	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
EPC Services Company [Member]
Concentration risk percentage		12.00%	10.00%	18.00%
Inox Wind Limited [Member]
Concentration risk percentage	10.00%	10.00%	10.00%	10.00%
Tri-state Generation and Transmission Association Inc [Member]
Concentration risk percentage	12.00%	0.00%	10.00%	0.00%
Micron Technology [Member]
Concentration risk percentage	10.00%		10.00%	10.00%
Reed & Reed Inc. [Member]
Concentration risk percentage	10.00%	25.00%	10.00%	12.00%
Siemens Gamesa Renewable Energy [Member]
Concentration risk percentage		10.00%	10.00%	13.00%

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
-Name Accounting Standards Codification
-Topic 280
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Paragraph 21
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-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

+ Details

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