Note 3 - Revenue Recognition (Tables)

9 Months Ended

Dec. 31, 2020

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended December 31, 2020				Nine Months Ended December 31, 2020
Product Line:	Grid		Wind		Grid		Wind
Equipment and systems	$	15,930	$	6,153	$	47,729	$	12,828
Services and technology development		1,156		393		3,420		1,984
Total	$	17,086	$	6,546	$	51,149	$	14,812
Region:
Americas	$	13,394	$	14	$	39,626	$	56
Asia Pacific		351		6,461		6,736		14,463
EMEA		3,341		71		4,787		293
Total	$	17,086	$	6,546	$	51,149	$	14,812

	Three Months Ended December 31, 2019				Nine Months Ended December 31, 2019
Product Line:	Grid		Wind		Grid		Wind
Equipment and systems	$	14,040	$	2,160	$	32,438	$	7,742
Services and technology development		1,192		523		4,139		1,379
Total	$	15,232	$	2,683	$	36,577	$	9,120
Region:
Americas	$	10,164	$	2	$	28,663	$	49
Asia Pacific		330		2,647		2,550		8,968
EMEA		4,738		34		5,364		104
Total	$	15,232	$	2,683	$	36,577	$	9,120

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, 2020	$	5,711		$	1,631		$	26,142
Increases for costs incurred to fulfill performance obligations		—			6,635			—
Increase for balances acquired		101			—			2,700
Increase (decrease) due to customer billings		(8,255	)		—			42,785
Decrease due to cost recognition on completed performance obligations		—			(6,969	)		—
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations		6,644			—			(48,274	)
Other changes and FX impact		—			33			1,025
Ending balance as of December 31, 2020	$	4,201		$	1,330		$	24,378

	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		—			3,001			—
Increase (decrease) due to customer billings		(7,417	)		—			36,461
Decrease due to cost recognition on completed performance obligations		—			(2,221	)		—
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations		9,820			—			(28,768	)
Other changes and FX impact		(3	)		(1	)		(69	)
Ending balance as of December 31, 2019	$	4,613		$	1,097		$	23,143

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

		Three Months Ended						Nine Months Ended
	Reportable	December 31,						December 31,
	Segment	2020			2019			2020			2019
Inox Wind Limited	Wind		24	%		<10%			12	%		11	%
Department of Homeland Security	Grid		<10%			22	%		<10%			12	%
Vestas	Grid		<10%			25	%		<10%			10	%
EPC Services	Grid		14	%		<10%			17	%		<10%