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Note 16 - Business Segments - Total Business Segments Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Mar. 31, 2020
Total assets	$ 175,047	$ 124,109
Operating Segments [Member] | Grid [Member]
Total assets	83,623	44,044
Operating Segments [Member] | Wind [Member]
Total assets	6,140	14,250
Corporate, Non-Segment [Member]
Total assets	$ 85,284	$ 65,815

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

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Balance Type:	debit
Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

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Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: