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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
	Jun. 30, 2022	Jun. 30, 2021
Micron Technology [Member]
Micron Technology	10.00%	21.00%
Nextera Energy Resources [Member]
Micron Technology	0.00%	12.00%
SGL Carbon LLC [Member]
Micron Technology	10.00%	10.00%
Ascend Performance Materials Ops LLC [Member]
Micron Technology	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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
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-SubTopic 10
-Section 50
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-URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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