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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Revenues	$ 21,213	$ 13,770
Grid [Member]
Revenues	17,715	9,855
Grid [Member] | Americas [Member]
Revenues	10,554	7,801
Grid [Member] | Asia Pacific [Member]
Revenues	6,015	1,827
Grid [Member] | EMEA [Member]
Revenues	1,146	227
Wind [Member]
Revenues	3,498	3,915
Wind [Member] | Americas [Member]
Revenues	12	46
Wind [Member] | Asia Pacific [Member]
Revenues	3,269	3,856
Wind [Member] | EMEA [Member]
Revenues	217	13
Equipment and Systems [Member] | Grid [Member]
Revenues	16,537	8,354
Equipment and Systems [Member] | Wind [Member]
Revenues	2,618	3,505
Services and Technology Development [Member] | Grid [Member]
Revenues	1,178	1,501
Services and Technology Development [Member] | Wind [Member]
Revenues	$ 880	$ 410

X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
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-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

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