Note 2 - Revenue Recognition (Tables)

3 Months Ended

Jun. 30, 2019

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended June 30, 2019
Product Line:	Grid		Wind
Equipment and systems	$	8,354	$	3,505
Services and technology development		1,501		410
Total	$	9,855	$	3,915
Region:
Americas	$	7,801	$	46
Asia Pacific		1,827		3,856
EMEA		227		13
Total	$	9,855	$	3,915
	Three Months Ended June 30, 2018
Product Line:	Grid		Wind
Equipment and systems	$	7,462	$	3,492
Services and technology development		1,467		186
Total	$	8,929	$	3,678
Region:
Americas	$	7,496	$	23
Asia Pacific		808		3,595
EMEA		625		60
Total	$	8,929	$	3,678

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

	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		—			1,132			—
Increase (decrease) due to customer billings		(3,221	)		—			4,281
Decrease due to cost recognition on completed performance obligations		—			(48	)		—
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations		4,824			(9	)		(3,324	)
Other changes and FX impact		(16	)		34			(764	)
Ending balance as of June 30, 2018	$	4,603		$	2,077		$	19,473
	Unbilled Accounts Receivable			Deferred Program Costs			Contract Liabilities
Beginning balance as of March 31, 2019	$	2,213		$	318		$	15,521
Increases for costs incurred to fulfill performance obligations		0			771			0
Increase (decrease) due to customer billings		(1,584	)		0			10,857
Decrease due to cost recognition on completed performance obligations		0			(4	)		0
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations		1,467			0			(7,761	)
Other changes and FX impact		(3	)		3			73
Ending balance as of June 30, 2019	$	2,093		$	1,088		$	18,690

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

		Three Months Ended
	Reportable	June 30, 2019
	Segment	2019	2018
Inox Wind Limited	Wind	27%	25%
Vestas	Grid	<10%	36%
Micron Technology	Grid	25%	<10%