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Note 2 - Revenue Recognition (Tables)

6 Months Ended

Sep. 30, 2019

Notes Tables

Disaggregation of Revenue [Table Text Block]

		Three Months Ended September 30, 2019								Six Months Ended September 30, 2019
Product Line:		Grid				Wind				Grid				Wind
Equipment and systems		$	10,044			$	2,077			$	18,399			$	5,581
Services and technology development			1,445				446				2,946				856
Total		$	11,489			$	2,523			$	21,345			$	6,437
Region:
Americas		$	10,698			$	1			$	18,499			$	47
Asia Pacific			393				2,464				2,220				6,320
EMEA			398				58				626				70
Total		$	11,489			$	2,523			$	21,345			$	6,437

		Three Months Ended September 30, 2018								Six Months Ended September 30, 2018
Product Line:		Grid				Wind				Grid				Wind
Equipment and systems		$	5,503			$	7,219			$	12,957			$	10,711
Services and technology development			2,066				88				3,541				274
Total		$	7,569			$	7,307			$	16,498			$	10,985
Region:
Americas		$	5,052			$	24			$	12,548			$	47
Asia Pacific			2,308				7,278				3,115				10,873
EMEA			209				5				835				65
Total		$	7,569			$	7,307			$	16,498			$	10,985

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

		Unbilled Accounts Receivable				Deferred Program Costs				Contract Liabilities
Beginning balance as of March 31, 2019		$	2,213			$	318			$	15,519
Increases for costs incurred to fulfill performance obligations			—				2,153				—
Increase (decrease) due to customer billings			(2,926	)			—				19,340
Decrease due to cost recognition on completed performance obligations			—				(310	)			—
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations			4,711				—				(18,534	)
Other changes and FX impact			(4	)			(9	)			(313	)
Ending balance as of September 30, 2019		$	3,994			$	2,152			$	16,012

		Unbilled Accounts Receivable				Deferred Program Costs				Contract Liabilities
Beginning balance as of March 31, 2018		$	3,016			$	2,567			$	21,937
Impact of adoption of ASC 606			—				(1,599	)			(2,657	)
Increases for costs incurred to fulfill performance obligations			—				1,267				—
Increase (decrease) due to customer billings			(7,886	)			—				7,828
Decrease due to cost recognition on completed performance obligations			—				(1,033	)			—
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations			7,439				(9	)			(8,296	)
Other changes and FX impact			(19	)			24				(864	)
Ending balance as of September 30, 2018		$	2,550			$	1,217			$	17,948

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

			Three Months Ended								Six Months Ended
	Reportable		September 30,								September 30,
	Segment		2019				2018				2019				2018
Inox Wind Limited	Wind			<10%				45	%			17	%			36	%
Micron Technology	Grid			<10%				<10%				14	%			<10%
Vestas	Grid			<10%				11	%			<10%				23	%
Quanta Power	Grid			—	%			12	%			—	%			<10%
Hoffman Construction	Grid			25	%			—	%			12	%			—	%
M.J. Electric, LLC	Grid			25	%			—	%			13	%			—	%

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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 10
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045

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-Name Accounting Standards Codification
-Topic 606
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-Section 50
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