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Note 17 - Business Segments - Operating Results for Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Revenues	$ 17,915	$ 14,134	$ 45,697	$ 41,618
Operating profit (loss)	(6,619)	20,765	(16,974)	40,366
Corporate, Non-Segment [Member]
Operating profit (loss)	(590)	(839)	(1,236)	(2,851)
Grid [Member]
Revenues	15,232	6,826	36,577	23,325
Grid [Member] | Operating Segments [Member]
Operating profit (loss)	(3,732)	(2,665)	(9,723)	(8,202)
Wind [Member]
Revenues	2,683	7,308	9,120	18,293
Wind [Member] | Operating Segments [Member]
Operating profit (loss)	$ (2,297)	$ 24,269	$ (6,015)	$ 51,419

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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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
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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