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Note 3 - Revenue Recognition (Tables)

6 Months Ended

Sep. 30, 2021

Notes Tables

Disaggregation of Revenue [Table Text Block]

		Three Months Ended September 30, 2021								Six Months Ended September 30, 2021
Product Line:		Grid				Wind				Grid				Wind
Equipment and systems		$	23,031			$	1,826			$	44,189			$	2,860
Services and technology development			1,588				1,463				3,930				2,349
Total		$	24,619			$	3,289			$	48,119			$	5,209
Region:
Americas		$	18,115			$	59			$	40,760			$	78
Asia Pacific			3,269				3,220				3,867				5,091
EMEA			3,235				10				3,492				40
Total		$	24,619			$	3,289			$	48,119			$	5,209

		Three Months Ended September 30, 2020								Six Months Ended September 30, 2020
Product Line:		Grid				Wind				Grid				Wind
Equipment and systems		$	15,261			$	4,059			$	31,798			$	6,676
Services and technology development			1,086				711				2,264				1,591
Total		$	16,347			$	4,770			$	34,062			$	8,267
Region:
Americas		$	15,677			$	30			$	26,231			$	42
Asia Pacific			370				4,734				6,385				8,002
EMEA			300				6				1,446				223
Total		$	16,347			$	4,770			$	34,062			$	8,267

Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]

		Unbilled Accounts Receivable				Deferred Program Costs				Contract Liabilities
Beginning balance as of March 31, 2021		$	5,765			$	977			$	21,257
Increases for costs incurred to fulfill performance obligations			—				2,277				—
Increase for balances acquired			—				634				10,048
Increase (decrease) due to customer billings			(4,807	)			—				34,344
Decrease due to cost recognition on completed performance obligations			—				(3,055	)			—
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations			7,838				—				(34,169	)
Other changes and FX impact			—				(3	)			38
Ending balance as of September 30, 2021		$	8,796			$	830			$	31,518

		Unbilled Accounts Receivable				Deferred Program Costs				Contract Liabilities
Beginning balance as of March 31, 2020		$	5,711			$	1,631			$	26,142
Increases for costs incurred to fulfill performance obligations			—				3,279				—
Increase (decrease) due to customer billings			(5,929	)			—				23,931
Decrease due to cost recognition on completed performance obligations			—				(3,314	)			—
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations			6,186				—				(28,678	)
Other changes and FX impact			0				18				561
Ending balance as of September 30, 2020		$	5,968			$	1,614			$	21,956

Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]

			Three Months Ended								Six Months Ended
	Reportable		September 30,								September 30,
	Segment		2021				2020				2021				2020
EPC Services	Grid		<10%					12	%			<10%				18	%
Inox Wind Limited	Wind		10		%			<10%				<10%				<10%
Tri-State Generation and Transmission Association, Inc.	Grid		12		%			—				<10%				—
Micron Technology	Grid		<10%					<10%				10	%			<10%
Reed & Reed Inc.	Grid			<10%			25		%			<10%				12	%
Siemens Gamesa Renewable Energy Pty. Ltd.	Grid		<10%					<10%				<10%				13	%

X

- Definition

Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045

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