American Superconductor (AMSC) 10-Q 5 Nov 19 2019 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Sep. 30, 2019	Nov. 01, 2019
Document Information [Line Items]
Entity Registrant Name	AMERICAN SUPERCONDUCTOR CORP /DE/
Entity Central Index Key	0000880807
Trading Symbol	amsc
Current Fiscal Year End Date	--03-31
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Common Stock, Shares Outstanding (in shares)		21,765,463
Entity Shell Company	false
Document Type	10-Q
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false
Title of 12(b) Security	Common Stock ($0.01 par value)

Unaudited Condensed Consolidate

Unaudited Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Current assets:
Cash and cash equivalents	$ 52,829	$ 77,483
Accounts receivable, net	10,073	7,855
Inventory	15,497	12,119
Note receivable, current portion		2,888
Prepaid expenses and other current assets	5,036	3,053
Total current assets	83,435	103,398
Marketable securities	10,000	0
Property, plant and equipment, net	8,610	8,972
Intangibles, net	2,720	2,890
Right-of-use asset	3,607	0
Goodwill	1,719	1,719
Restricted cash	5,736	715
Deferred tax assets	1,291	1,357
Other assets	325	279
Total assets	117,443	119,330
Current liabilities:
Accounts payable and accrued expenses	18,724	15,885
Lease liability, current portion	424	0
Derivative liabilities	556	4,942
Deferred revenue, current portion	8,345	7,557
Total current liabilities	28,049	28,384
Deferred revenue, long term portion	7,667	7,962
Lease liability, long term portion	3,240	0
Deferred tax liabilities	1,757	1,698
Other liabilities	44	93
Total liabilities	40,757	38,137
Commitments and contingencies (Note 15)
Stockholders' equity:
Common stock	218	216
Additional paid-in capital	1,045,833	1,044,622
Treasury stock	(2,606)	(2,101)
Accumulated other comprehensive loss	(856)	(5)
Accumulated deficit	(965,903)	(961,539)
Total stockholders' equity	76,686	81,193
Total liabilities and stockholders' equity	$ 117,443	$ 119,330

Unaudited Condensed Consolida_2

Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues	$ 14,012	$ 14,876	$ 27,782	$ 27,483
Cost of revenues	10,248	11,252	22,441	19,966
Gross margin	3,764	3,624	5,341	7,517
Operating expenses:
Research and development	2,398	2,264	4,871	5,103
Selling, general and administrative	5,400	5,175	10,655	10,961
Amortization of acquisition-related intangibles	85	85	170	170
Restructuring	0	93	0	403
(Gain) on Sinovel settlement, net	0	(28,720)	0	(28,720)
Total operating expenses	7,883	(21,103)	15,696	(12,083)
Operating (loss) income	(4,119)	24,727	(10,355)	19,600
Change in fair value of warrants	1,145	282	4,092	(182)
Interest income, net	335	232	840	433
Other income, net	1,520	325	976	934
(Loss) income before income tax expense	(1,119)	25,566	(4,447)	20,785
Income tax (benefit) expense	(294)	3,008	(83)	2,964
Net (loss) income	$ (825)	$ 22,558	$ (4,364)	$ 17,821
Net (loss) income per common share
Basic (in dollars per share)	$ (0.04)	$ 1.11	$ (0.21)	$ 0.88
Diluted (in dollars per share)	$ (0.10)	$ 1.10	$ (0.40)	$ 0.87
Weighted average number of common shares outstanding
Basic (in shares)	20,656	20,313	20,586	20,240
Diluted (in shares)	20,723	20,581	20,736	20,560

Unaudited Condensed Consolida_3

Unaudited Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net (loss) income	$ (825)	$ 22,558	$ (4,364)	$ 17,821
Other comprehensive loss, net of tax:
Cumulative translation adjustment	(1,269)	(678)	(851)	(894)
Total other comprehensive loss, net of tax	(1,269)	(678)	(851)	(894)
Comprehensive (loss) income	$ (2,094)	$ 21,880	$ (5,215)	$ 16,927

Unaudited Consolidated Statemen

Unaudited Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Mar. 31, 2018	21,139
Balance at Mar. 31, 2018	$ 211	$ 1,041,113	$ (1,645)	$ 883	$ (988,333)	$ 52,229
Issuance of common stock - ESPP (in shares)	12
Issuance of common stock - ESPP		71				71
Issuance of common stock - restricted shares (in shares)	416
Issuance of common stock - restricted shares	$ 4	(4)
Stock-based compensation expense		1,610				1,610
Issuance of stock for 401(k) match (in shares)	27
Issuance of stock for 401(k) match		172				172
Repurchase of treasury stock			(396)			(396)
Cumulative translation adjustment				(894)		(894)
Cumulative impact of adoption of ASU No. 2014-09					33	33
Net (loss) income					17,821	17,821
Cumulative translation adjustment				(894)		(894)
Balance (in shares) at Sep. 30, 2018	21,594
Balance at Sep. 30, 2018	$ 215	1,042,962	(2,041)	(11)	(970,479)	70,646
Balance (in shares) at Jun. 30, 2018	21,429
Balance at Jun. 30, 2018	$ 214	1,041,980	(1,884)	667	(993,037)	47,940
Issuance of common stock - ESPP (in shares)	12
Issuance of common stock - ESPP		71				71
Issuance of common stock - restricted shares (in shares)	140
Issuance of common stock - restricted shares	$ 1	(1)
Stock-based compensation expense		825				825
Issuance of stock for 401(k) match (in shares)	13
Issuance of stock for 401(k) match		87				87
Repurchase of treasury stock						(157)
Cumulative translation adjustment				(678)		(678)
Net (loss) income					22,558	22,558
Cumulative translation adjustment				(678)		(678)
Balance (in shares) at Sep. 30, 2018	21,594
Balance at Sep. 30, 2018	$ 215	1,042,962	(2,041)	(11)	(970,479)	70,646
Balance (in shares) at Mar. 31, 2019	21,652
Balance at Mar. 31, 2019	$ 216	1,044,622	(2,101)	(5)	(961,539)	81,193
Issuance of common stock - ESPP (in shares)	15
Issuance of common stock - ESPP		100				100
Issuance of common stock - restricted shares (in shares)	184
Issuance of common stock - restricted shares	$ 2	(2)
Stock-based compensation expense		646				646
Issuance of stock for 401(k) match (in shares)	20
Issuance of stock for 401(k) match		173				173
Repurchase of treasury stock			(505)			(505)
Cumulative translation adjustment				(851)		(851)
Net (loss) income					(4,364)	(4,364)
Issuance of common stock - warrant exercise (in shares)	23
Issuance of common stock - warrant exercise		294				294
Cumulative translation adjustment				(851)		(851)
Balance (in shares) at Sep. 30, 2019	21,894
Balance at Sep. 30, 2019	$ 218	1,045,833	(2,606)	(856)	(965,903)	76,686
Balance (in shares) at Jun. 30, 2019	21,857
Balance at Jun. 30, 2019	$ 218	1,045,244	(2,384)	413	(965,078)	78,413
Issuance of common stock - ESPP (in shares)	15
Issuance of common stock - ESPP		100				100
Issuance of common stock - restricted shares (in shares)	10
Issuance of common stock - restricted shares
Stock-based compensation expense		397				397
Issuance of stock for 401(k) match (in shares)	12
Issuance of stock for 401(k) match		92				92
Repurchase of treasury stock			(222)			(222)
Cumulative translation adjustment		(1,269)				(1,269)
Net (loss) income					(825)	(825)
Cumulative translation adjustment		(1,269)				(1,269)
Balance (in shares) at Sep. 30, 2019	21,894
Balance at Sep. 30, 2019	$ 218	$ 1,045,833	$ (2,606)	$ (856)	$ (965,903)	$ 76,686

Unaudited Condensed Consolida_4

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net (loss) income	$ (4,364)	$ 17,821
Adjustments to reconcile net loss to net cash (used in)/provided by operations:
Depreciation and amortization	2,262	2,307
Stock-based compensation expense	646	1,610
Provision for excess and obsolete inventory	196	514
Fair Value Adjustment of Warrants	(4,092)	182
Non-cash interest income	(112)	(112)
Other non-cash items	(888)	(727)
Changes in operating asset and liability accounts:
Accounts receivable	(2,244)	(279)
Inventory	(3,589)	1,278
Prepaid expenses and other assets	(1,810)	(572)
Accounts payable and accrued expenses	2,799	2,166
Deferred revenue	711	(593)
Net cash (used in)/provided by operating activities	(10,485)	23,595
Cash flows from investing activities:
Purchase of property, plant and equipment	(1,736)	(418)
Proceeds from the sale of property, plant and equipment	3,001	138
Purchase of marketable securities	(10,000)
Change in other assets	66	(131)
Net cash used in investing activities	(8,669)	(411)
Cash flows from financing activities:
Employee taxes paid related to net settlement of equity awards	(505)	(396)
Proceeds from exercise of employee stock options and ESPP	100	71
Net cash used in financing activities	(405)	(325)
Effect of exchange rate changes on cash	(74)	(774)
Net (decrease)/increase in cash, cash equivalents and restricted cash	(19,633)	22,085
Cash, cash equivalents and restricted cash at beginning of period	78,198	34,249
Cash, cash equivalents and restricted cash at end of period	58,565	56,334
Supplemental schedule of cash flow information:
Cash paid for income taxes, net of refunds	130	1,438
Issuance of common stock to settle liabilities	173	172
Hercules [Member]
Supplemental schedule of cash flow information:
Issuance of common stock to Hercules to settle warrant liability	$ 294	$ 0

Note 1 - Nature of the Business

Note 1 - Nature of the Business and Operations and Liquidity	6 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. Nature of the Business and Operations American Superconductor Corporation (together with its subsidiaries, “AMSC®” or the “Company”) was founded on April 9, 1987. These unaudited condensed consolidated financial statements of the Company have been prepared on a going concern basis in accordance with United States generally accepted accounting principles (“GAAP”) and the Securities and Exchange Commission’s (“SEC”) instructions to Form 10 not September 30, 2019 2018 September 30, 2019 not may March 31, 2019 10 March 31, 2019 June 5, 2019. Liquidity The Company has historically experienced recurring operating losses and as of September 30, 2019 965.9 September 30, 2019 62.8 no twelve twenty-four six September 30, 2019 10.5 On July 3, 2018, $57.5 two first $32.5 July 4, 2018, nine December 31, 2018 second $25.0 December 27, 2018. 2018 $52.7 On February 1, 2018, 64 64 $23.0 $17.0 $6.0 64 March 28, 2018, $16.9 1.96%. second second first $3.0 March 28, 2019 second $3.0 May 23, 2019. In December 2015, $210.0 three three The Company believes that based on the information presented above and its quarterly management assessment, it has sufficient liquidity to fund its operations and capital expenditures for the next twelve six September 30, 2019 no

Note 2 - Revenue Recognition

Note 2 - Revenue Recognition	6 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	2. On April 1, 2018, 606, Revenue from Contracts with Customers, and all the related amendments and applied it to all contracts that were not April 1, 2018 The Company’s revenues in its Grid segment are derived primarily through enabling the transmission and distribution of power, providing planning services that allow it to identify power grid needs and risks, and developing ship protection systems for the U.S. Navy. The Company’s revenues in its Wind segment are derived primarily through supplying advanced power electronics and control systems, licensing its highly engineered wind turbine designs, and providing extensive customer support services to wind turbine manufacturers. The Company records revenue based on a five 606. three six September 30, 2019 77 In the Company's equipment and system product line, each contract with a customer summarizes each product sold to a customer, which typically represent distinct performance obligations. A contract's transaction price is allocated to each distinct performance obligation using the respective standalone selling price which is determined primarily using the cost-plus expected margin approach and recognized as revenue when, or as, the performance obligation is satisfied. The majority of the Company’s product sales transfer control to the customer in line with the contracted delivery terms and revenue is recorded at the point in time when title and risk transfer to the customer, as the Company has determined that this is the point in time that control transfers to the customer. The Company's equipment and system product line includes certain contracts which do not not 606. not 606 three six September 30, 2019 $0.7 $1.1 no three six September 30, 2018 In the Company's service and technology development product line, there are several different types of transactions and each begins with a contract with a customer that summarizes each product sold to a customer, which typically represents distinct performance obligations. The technology development transactions are primarily for activities that have no not not not 606, no The Company's service contracts can include a purchase order from a customer for specific goods in which each item is a distinct performance obligation satisfied at a point in time at which control of the goods is transferred to the customer. This transfer occurs based on the contracted delivery terms or when the requested service work has been completed. The transaction price for these goods is allocated based on the adjusted market approach considering similar transactions under similar circumstances. Service contracts are also derived from ongoing maintenance contracts and extended service-type warranty contracts. In these transactions, the Company is contracted to provide an ongoing service over a specified period of time. As the customer is consuming the benefits as the service is being provided, the revenue is recognized over time ratably. The Company’s policy is to not The Company provides assurance-type warranties on all product sales for a term of typically one two four The Company records revenue net of sales tax, value added tax, excise tax and other taxes collected concurrent with revenue-producing activities. The Company has elected to recognize the cost for freight and shipping when control over the products sold passes to customers and revenue is recognized. The Company has elected to recognize incremental costs of obtaining a contract as expense when incurred except in contracts where the amortization period would exceed twelve not twelve The Company’s contracts with customers do not may 30 60 The following tables disaggregate the Company’s revenue by product line and by shipment destination: 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 As of September 30, 2019 September 30, 2018 7, 8, 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 The Company’s remaining performance obligations represent the unrecognized revenue value of the Company’s contractual commitments. The Company’s performance obligations may September 30, 2019 606 twelve 50.4 7.2 thirteen sixty twelve twelve first three twelve twelve not not The following table sets forth customers who represented 10% three six September 30, 2019 2018 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 % — %

Note 3 - Stock-based Compensati

Note 3 - Stock-based Compensation	6 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Share-based Payment Arrangement [Text Block]	3. The Company accounts for its stock-based compensation at fair value. The following table summarizes stock-based compensation expense by financial statement line item for the three six September 30, 2019 2018 Three Months Ended September 30, Six Months Ended September 30, 2019 2018 2019 2018 Cost of revenues $ 21 $ 50 $ 24 $ 90 Research and development 92 70 103 121 Selling, general and administrative 283 705 519 1,399 Total $ 397 $ 825 $ 646 $ 1,610 The Company issued 13,174 170,500 six September 30, 2019 37,075 413,000 six September 30, 2018 2 3 The estimated fair value of the Company’s stock-based awards, less expected annual forfeitures, is amortized over the awards’ service period. The total unrecognized compensation cost for unvested outstanding stock options was less than $ 0.1 September 30, 2019 1.7 3.1 September 30, 2019 1.4 The Company granted 5,939 six September 30, 2019 not three September 30, 2019 three six September 30, 2018 six September 30, 2019 2 six September 30, 2019 Three Months Ended September 30, Six Months Ended September 30, 2019 2018 2019 2018 Expected volatility N/A N/A 66.5 % N/A Risk-free interest rate N/A N/A 1.8 % N/A Expected life (years) N/A N/A 5.91 N/A Dividend yield N/A N/A None N/A

Note 4 - Computation of Net Los

Note 4 - Computation of Net Loss per Common Share	6 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Earnings Per Share [Text Block]	4. Basic net loss per share (“EPS”) is computed by dividing net loss by the weighted-average number of common shares outstanding for the period. Where applicable, diluted EPS is computed by dividing the net loss by the weighted-average number of common shares and dilutive common equivalent shares outstanding during the period, calculated using the treasury stock method. Common equivalent shares include the effect of restricted stock, exercise of stock options and warrants and contingently issuable shares. Stock options and warrants that are out-of-the-money with exercise prices greater than the average market price of the underlying common shares and shares of performance based restricted stock where the contingency was not three six September 30, 2019 0.2 not three September 30, 2018 1.6 not 0.3 0.9 0.4 six September 30, 2018 1.4 not 0.2 0.9 0.3 The following table reconciles the numerators and denominators of the earnings per share calculation for the three six September 30, 2019 2018 Three Months Ended September 30, Six Months Ended September 30, 2019 2018 2019 2018 Numerator: Net (loss) income $ (825 ) $ 22,558 $ (4,364 ) $ 17,821 Less: decrease in fair value of warrants, net of income tax (1,145 ) 0 (4,092 ) 0 Plus: change in fair value due to exercise of warrants 0 0 83 0 Net income (loss) - diluted $ (1,970 ) $ 22,558 $ (8,373 ) $ 17,821 Denominator: Weighted-average shares of common stock outstanding 21,678 21,252 21,538 21,126 Weighted-average shares subject to repurchase (1,022 ) (939 ) (952 ) (886 ) Shares used in per-share calculation ― basic 20,656 20,313 20,586 20,240 Common stock awards 0 268 0 320 Common stock warrants 67 0 150 0 Shares used in per-share calculation ― diluted 20,723 20,581 20,736 20,560 Net (loss) income per share ― basic $ (0.04 ) $ 1.11 $ (0.21 ) $ 0.88 Net (loss) income per share ― diluted $ (0.10 ) $ 1.10 $ (0.40 ) $ 0.87 For the three six September 30, 2019, 818,181 $ 7.81 three six September 30, 2019, $8.50 $9.56 66,638 150,025 $1.1 $4.1

Note 5 - Goodwill

Note 5 - Goodwill	6 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Goodwill Disclosure [Text Block]	5. The Company did not three six September 30, 2019

Note 6 - Fair Value Measurement

Note 6 - Fair Value Measurements	6 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Fair Value Disclosures [Text Block]	6. A valuation hierarchy for disclosure of the inputs to valuation used to measure fair value has been established. This hierarchy prioritizes the inputs into three Level 1 - Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. Level 2 - Inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not Level 3 - Unobservable inputs that reflect the Company’s assumptions that market participants would use in pricing the asset or liability. The Company develops these inputs based on the best information available, including its own data. The Company provides a gross presentation of activity within Level 3 1 2 1 2 3 not 1, 2 3 six September 30, 2019 A financial asset’s or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The following table provides the assets and liabilities carried at fair value on a recurring basis, measured as of September 30, 2019 March 31, 2019 Total Carrying Value Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) September 30, 2019: Assets: Cash equivalents $ 49,034 $ 49,034 $ — $ — Marketable securities $ 10,000 $ 10,000 $ — $ — Derivative liabilities: Warrants $ 556 $ — $ — $ 556 Total Carrying Value Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) March 31, 2019: Assets: Cash equivalents $ 41,839 $ 41,839 $ — $ — Derivative liabilities: Warrants $ 4,942 $ — $ — $ 4,942 The table below reflects the activity for the Company’s major classes of liabilities measured at fair value on a recurring basis (in thousands): Warrants April 1, 2019 $ 4,942 Mark to market adjustment (4,092 ) Warrant exercise (294 ) Balance at September 30, 2019 $ 556 Warrants April 1, 2018 $ 1,217 Mark to market adjustment 182 Balance at September 30, 2018 $ 1,399 Valuation Techniques Cash Equivalents Cash equivalents consist of highly liquid instruments with maturities of three 1 Marketable Securities Marketable securities consist of certificates of deposit with maturities of greater than 12 1 Warrants Warrants were issued in conjunction with an equity offering to Hudson Bay Capital in November 2014 April 8, 2019. The Company relies on various assumptions in a lattice model to determine the fair value of warrants. The Company has valued the warrants within Level 3 13,

Note 7 - Accounts Receivable

Note 7 - Accounts Receivable	6 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Accounts Receivable [Text Block]	7. Accounts receivable at September 30, 2019 March 31, 2019 September 30, 2019 March 31, 2019 Accounts receivable (billed) $ 6,079 $ 5,642 Accounts receivable (unbilled) 3,994 2,213 Accounts receivable, net $ 10,073 $ 7,855

Note 8 - Inventory

Note 8 - Inventory	6 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Inventory Disclosure [Text Block]	8. Inventory, net of reserves, at September 30, 2019 March 31, 2019 September 30, 2019 March 31, 2019 Raw materials $ 7,421 $ 5,474 Work-in-process 1,943 1,922 Finished goods 3,981 4,405 Deferred program costs 2,152 318 Net inventory $ 15,497 $ 12,119 The Company recorded inventory write-downs of $ 0.1 $0.4 three September 30, 2019 2018 0.2 $0.5 six September 30, 2019 2018 Deferred program costs as of September 30, 2019 March 31, 2019

Note 9 - Note Receivable

Note 9 - Note Receivable	6 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Notes Receivable [Text Block]	9. The Company entered into the PSA dated February 1, 2018, 64 64 64 $23.0 $1.0 $6.0 two $3.0 1.96% March 31, 2019 March 31, 2020. first March 28, 2019 second May 23, 2019. The note receivable was discounted to its present value of $5.7 6%, $0.3 $0.1 2017 05 Other Income - Gains and Losses from the Derecognition of Non-financial Assets (Subtopic 610 20 2014 09 Revenue from Contracts with Customers (Topic 606 April 1, 2018. Note receivable as of September 30, 2019 March 31, 2019 Current assets September 30, 2019 March 31, 2019 Note receivable, current $ — $ 3,000 Note receivable discount — (112 ) Total current note receivable $ — $ 2,888

Note 10 - Property, Plant and E

Note 10 - Property, Plant and Equipment	6 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	10. The cost and accumulated depreciation of property, plant and equipment at September 30, 2019 March 31, 2019 September 30, 2019 March 31, 2019 Construction in progress - equipment $ 2,223 $ 603 Equipment and software 45,127 45,705 Furniture and fixtures 1,259 1,269 Leasehold improvements 1,976 1,955 Property, plant and equipment, gross 50,585 49,532 Less accumulated depreciation (41,975 ) (40,560 ) Property, plant and equipment, net $ 8,610 $ 8,972 Depreciation expense was $ 1.0 $1.1 three September 30, 2019 2018 2.1 $2.1 six September 30, 2019 2018

Note 11 - Accounts Payable and

Note 11 - Accounts Payable and Accrued Expenses	6 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Accounts Payable and Accrued Liabilities Disclosure [Text Block]	11. Accounts payable and accrued expenses at September 30, 2019 March 31, 2019 September 30, 2019 March 31, 2019 Accounts payable $ 6,164 $ 2,939 Accrued inventories in-transit 603 244 Accrued other miscellaneous expenses 1,772 1,759 Advanced deposits 1,771 631 Accrued compensation 3,730 5,404 Income taxes payable 3,043 3,363 Accrued product warranty 1,641 1,545 Total $ 18,724 $ 15,885 The Company generally provides a one three Product warranty activity was as follows (in thousands): Three Months Ended September 30, Six Months Ended September 30, 2019 2018 2019 2018 Balance at beginning of period $ 1,606 $ 1,752 $ 1,545 $ 1,769 Change in accruals for warranties during the period 71 213 156 317 Settlements during the period (36 ) (205 ) (60 ) (326 ) Balance at end of period $ 1,641 $ 1,760 $ 1,641 $ 1,760

Note 12 - Income Taxes

Note 12 - Income Taxes	6 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Income Tax Disclosure [Text Block]	12. The Company recorded an income tax benefit of $ 0.3 $3.0 three September 30, 2019 2018 0.1 $3.0 six September 30, 2019 2018 Accounting for income taxes requires a two first not second 50% not not six September 30, 2019 not March 31, 2019

Note 13 - Warrants and Derivati

Note 13 - Warrants and Derivative Liabilities	6 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Derivative Instruments and Hedging Activities Disclosure [Text Block]	13. The Company accounts for its warrants and contingent consideration as liabilities due to certain adjustment provisions within the instruments, which require that they be recorded at fair value. The warrants are subject to revaluation at each balance sheet date and any change in fair value is recorded as a change in fair value of warrants until the earlier of its expiration or its exercise at which time the warrant liability will be reclassified to equity. The Company calculated the fair value of the warrants utilizing an integrated lattice model. See Note 6, Hercules Warrants On December 19, 2014, second 58,823 $7.85 May 2017, September 2017 January 2017. $0.4 March 31, 2019. April 8, 2019, 22,821 April 17, 2019. $0.1 six September 30, 2019 November 2014 On November 13, 2014, 909,090 one 0.9 one 818,181 “November 2014 November 2014 $7.81 November 13, 2019. Following is a summary of the key assumptions used to calculate the fair value of the November 2014 September 30, June 30, Fiscal Year 2019 2019 2019 Risk-free interest rate 1.90 % 2.11 % Expected annual dividend yield — — Expected volatility 62.84 % 60.58 % Term (years) 0.12 0.37 Fair value $0.6 million $1.7 million March 31, December 31, September 30, June 30, March 31, Fiscal Year 2018 2019 2018 2018 2018 2018 Risk-free interest rate 2.43% 2.61% 2.62% 2.40% 2.20% Expected annual dividend yield — — — — — Expected volatility 75.61% 70.29% 63.66% 67.40% 65.86% Term (years) 0.62 0.87 1.12 1.37 1.62 Fair value $4.6 million $3.6 million $1.3 million $1.6 million $1.1 million The Company recorded net gains 1.1 4.1 decreases November 2014 three six September 30, 2019 $0.3 $0.2 November 2014 three six September 30, 2018

Note 14 - Leases

Note 14 - Leases	6 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Lessee, Operating Leases [Text Block]	14. On April 1, 2019, 2016 02, Leases (Topic 842 842" not not not As a result of the adoption of ASC 842, $3.8 $3.8 no 842. No March 31, 2019 ASC 842 Adjustment April 1, 2019 Operating Leases: Right of use asset $ — $ 3,795 $ 3,795 Total operating lease right-of-use asset — 3,795 3,795 Operating lease liabilities – ST $ — $ 309 $ 309 Operating lease liabilities – LT — 3,512 3,512 Total operating lease liabilities — 3,821 3,821 Weighted-average remaining lease term 7.69 years Weighted-average discount rate 7.06 % All significant lease arrangements are recognized at lease commencement. Operating lease right–of-use assets and lease liabilities are recognized at commencement. The operating lease right-of-use asset includes any lease payments related to initial direct cost and prepayments and excludes any lease incentives. Lease expense is recognized on a straight-line basis over the lease term. The Company enters into a variety of operating lease agreements through the normal course of its business, but primarily real estate leases to support its operations. The agreements generally provide for fixed minimum rental payments and the payment of real estate taxes and insurance. Many of these leases have one five The Company also enters into leases for vehicles, IT equipment and service agreements, and other leases related to its manufacturing operations that are also included in the right-of-use asset and lease liability accounts if they are for a term of longer than twelve The discount rate was calculated using an incremental borrowing rate based on an assessment prepared by the Company through the use of Company credit ratings, consideration of its lease populations potential risk to its total capital structure, and a market rate for a collateralized loan for its risk profile, calculated by a third The Company did not Supplemental balance sheet information related to leases at September 30, 2019 September 30, 2019 Operating Leases: Right-of-use assets $ 3,607 Total right-of-use assets 3,607 Lease liabilities - ST $ 424 Lease liabilities - LT 3,240 Total operating lease liabilities 3,664 Weighted-average remaining lease term 7.31 years Weighted-average discount rate 7.07 % The costs related to the Company's leases for the three six September 30, 2019 Three Months Ended Six Months Ended September 30, 2019 September 30, 2019 Operating Lease: Operating lease costs - fixed $ 178 $ 356 Operating lease costs - variable 27 46 Short-term lease costs 176 214 Total lease costs 381 616 The Company’s estimated minimum future lease obligations under the Company's leases are as follows: Operating Leases Year ended March 31, 2020 $ 331 2021 670 2022 650 2023 624 2024 562 Thereafter 1,896 Total minimum lease payments 4,733 Less: interest (1,069 ) Present value of lease liabilities 3,664

Note 15 - Commitments and Conti

Note 15 - Commitments and Contingencies	6 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	15. Legal Contingencies From time to time, the Company is involved in legal and administrative proceedings and claims of various types. The Company records a liability in its consolidated financial statements for these matters when a loss is known or considered probable and the amount can be reasonably estimated. The Company reviews these estimates each accounting period as additional information is known and adjusts the loss provision when appropriate. If a matter is both probable to result in a liability and the amounts of loss can be reasonably estimated, the Company estimates and discloses the possible loss or range of loss to the extent necessary to make the consolidated financial statements not not not Other The Company enters into long-term construction contracts with customers that require the Company to obtain performance bonds. The Company is required to deposit an amount equivalent to some or all the face amount of the performance bonds into an escrow account until the termination of the bond. When the performance conditions are met, amounts deposited as collateral for the performance bonds are returned to the Company. In addition, the Company has various contractual arrangements in which minimum quantities of goods or services have been committed to be purchased on an annual basis. As of September 30, 2019 5.7 $5.0 $5.0 July 1, 2019.

Note 16 - Restructuring

Note 16 - Restructuring	6 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Restructuring and Related Activities Disclosure [Text Block]	16. The Company accounts for charges resulting from operational restructuring actions in accordance with ASC Topic 420, Exit or Disposal Cost Obligations 420” 712, Compensation—Nonretirement Postemployment Benefits 712” The $0.4 six September 30, 2018 The following table presents restructuring charges and cash payments for the six September 30, 2018 Severance pay Facility exit and and benefits Relocation costs Total Accrued restructuring balance at April 1, 2018 $ 262 $ 173 $ 435 Charges to operations — 403 403 Cash payments (173 ) (576 ) (749 ) Accrued restructuring balance at September 30, 2018 $ 89 $ — $ 89 All restructuring charges discussed above are included within restructuring in the Company’s unaudited condensed consolidated statements of operations. The Company includes accrued restructuring within accounts payable and accrued expenses. There was no six September 30, 2019 September 30, 2019

Note 17 - Business Segments

Note 17 - Business Segments	6 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	17. The Company reports its financial results in two Through the Company’s power grid offerings, the Grid business segment enables electric utilities, industrial facilities, and renewable energy project developers to connect, transmit and distribute power through our transmission planning services, power electronics, and superconductor-based systems. The sales process is enabled by transmission planning services that allow it to identify power grid congestion, poor power quality and other risks, which helps the Company determine how its solutions can improve network performance. These services often lead to sales of grid interconnection solutions for wind farms and solar power plants, power quality systems, and transmission and distribution cable systems. The Company also sells ship protection products to the U.S. Navy through its Grid business segment. Through the Company’s wind power offerings, the Wind business segment enables manufacturers to field highly competitive wind turbines through our advanced power electronics and control system products, engineered designs, and support services. The Company supplies advanced power electronics and control systems, licenses its highly engineered wind turbine designs, and provides extensive customer support services to wind turbine manufacturers. The Company’s design portfolio includes a broad range of drive trains and power ratings of 2 The operating results for the two Three Months Ended September 30, Six Months Ended September 30, 2019 2018 2019 2018 Revenues: Grid $ 11,489 $ 7,569 $ 21,345 $ 16,498 Wind 2,523 7,307 6,437 10,985 Total $ 14,012 $ 14,876 $ 27,782 $ 27,483 Three Months Ended September 30, Six Months Ended September 30, 2019 2018 2019 2018 Operating (loss) income: Grid $ (1,324 ) $ (2,870 ) $ (5,988 ) $ (5,537 ) Wind (2,398 ) 28,515 (3,721 ) 27,150 Unallocated corporate expenses (397 ) (918 ) (646 ) (2,013 ) Total $ (4,119 ) $ 24,727 $ (10,355 ) $ 19,600 The accounting policies of the business segments are the same as those for the consolidated Company. The Company’s business segments have been determined in accordance with the Company’s internal management structure, which is organized based on operating activities. The Company evaluates performance based upon several factors, of which the primary financial measures are segment revenues and segment operating loss. The disaggregated financial results of the segments reflect allocation of certain functional expense categories consistent with the basis and manner in which Company management internally disaggregates financial information for the purpose of assisting in making internal operating decisions. In addition, certain corporate expenses which the Company does not two Unallocated corporate expenses primarily consist of stock-based compensation expense of $ 0.4 $0.8 three September 30, 2019 2018 $0.1 three September 30, 2018 0.6 $1.6 six September 30, 2019 2018 $0.4 six September 30, 2018 Total assets for the two September 30, 2019 March 31, 2019 September 30, 2019 March 31, 2019 Grid $ 34,479 $ 31,075 Wind 12,474 8,167 Corporate assets 70,490 80,088 Total $ 117,443 $ 119,330

Note 18 - Recent Accounting Pro

Note 18 - Recent Accounting Pronouncements	6 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	18. In February 2016, 2016 02, Leases (Topic 842 840, Leases 12 December 15, 2018, • In July 2018, 2018 10, Codification improvements to Topic 842, 2018 10 2016 02. • In July 2018, 2018 11, Topic 842, 2018 11 not ASU 2016 02 April 1, 2019, 14 In June 2016, 2016 13, Financial Instruments-Credit Losses (Topic 326 2016 13 December 15, 2019, 2016 13 may In July 2017, 2017 11, Earnings per Share (Topic 260 Distinguishing Liabilities from Equity (Topic 480 815 2017 11 no December 15, 2018, April 1, 2019, 2017 11 no 480. In August 2017, 2017 12, Derivatives and Hedging (Topic 815 2017 12 December 15, 2018, April 1, 2019, 2017 12 no no In June 2018, 2018 08, Not 958 2018 08 1 958, Not 2 December 15, 2018, April 1, 2019, 2018 08 In August 2018, 2018 13, Fair Value Measurement (Topic 820 2018 13 December 15, 2019, 2018 13 may

Note 19 - Subsequent Events

Note 19 - Subsequent Events	6 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Subsequent Events [Text Block]	19. The Company has performed an evaluation of subsequent events through the time of filing this Quarterly Report on Form 10 no

Significant Accounting Policies

Significant Accounting Policies (Policies)	6 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Nature of Business and Operations, Policy [Policy Text Block]	Nature of the Business and Operations American Superconductor Corporation (together with its subsidiaries, “AMSC®”or the “Company”) was founded on April 9, 1987. These unaudited condensed consolidated financial statements of the Company have been prepared on a going concern basis in accordance with United States generally accepted accounting principles (“GAAP”) and the Securities and Exchange Commission’s (“SEC”) instructions to Form 10 not September 30, 2019 2018 September 30, 2019 not may March 31, 2019 10 March 31, 2019 June 5, 2019.
Liquidity, Policy [Policy Text Block]	Liquidity The Company has historically experienced recurring operating losses and as of September 30, 2019 965.9 September 30, 2019 62.8 no twelve twenty-four six September 30, 2019 10.5 On July 3, 2018, $57.5 two first $32.5 July 4, 2018, nine December 31, 2018 second $25.0 December 27, 2018. 2018 $52.7 On February 1, 2018, 64 64 $23.0 $17.0 $6.0 64 March 28, 2018, $16.9 1.96%. second second first $3.0 March 28, 2019 second $3.0 May 23, 2019. In December 2015, $210.0 three three The Company believes that based on the information presented above and its quarterly management assessment, it has sufficient liquidity to fund its operations and capital expenditures for the next twelve six September 30, 2019 no

Note 2 - Revenue Recognition (T

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 % — %

Note 3 - Stock-based Compensa_2

Note 3 - Stock-based Compensation (Tables)	6 Months Ended
	Sep. 30, 2019
Notes Tables
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]	Three Months Ended September 30, Six Months Ended September 30, 2019 2018 2019 2018 Cost of revenues $ 21 $ 50 $ 24 $ 90 Research and development 92 70 103 121 Selling, general and administrative 283 705 519 1,399 Total $ 397 $ 825 $ 646 $ 1,610
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Three Months Ended September 30, Six Months Ended September 30, 2019 2018 2019 2018 Expected volatility N/A N/A 66.5 % N/A Risk-free interest rate N/A N/A 1.8 % N/A Expected life (years) N/A N/A 5.91 N/A Dividend yield N/A N/A None N/A

Note 4 - Computation of Net L_2

Note 4 - Computation of Net Loss per Common Share (Tables)	6 Months Ended
	Sep. 30, 2019
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three Months Ended September 30, Six Months Ended September 30, 2019 2018 2019 2018 Numerator: Net (loss) income $ (825 ) $ 22,558 $ (4,364 ) $ 17,821 Less: decrease in fair value of warrants, net of income tax (1,145 ) 0 (4,092 ) 0 Plus: change in fair value due to exercise of warrants 0 0 83 0 Net income (loss) - diluted $ (1,970 ) $ 22,558 $ (8,373 ) $ 17,821 Denominator: Weighted-average shares of common stock outstanding 21,678 21,252 21,538 21,126 Weighted-average shares subject to repurchase (1,022 ) (939 ) (952 ) (886 ) Shares used in per-share calculation ― basic 20,656 20,313 20,586 20,240 Common stock awards 0 268 0 320 Common stock warrants 67 0 150 0 Shares used in per-share calculation ― diluted 20,723 20,581 20,736 20,560 Net (loss) income per share ― basic $ (0.04 ) $ 1.11 $ (0.21 ) $ 0.88 Net (loss) income per share ― diluted $ (0.10 ) $ 1.10 $ (0.40 ) $ 0.87

Note 6 - Fair Value Measureme_2

Note 6 - Fair Value Measurements (Tables)	6 Months Ended
	Sep. 30, 2019
Notes Tables
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	Total Carrying Value Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) September 30, 2019: Assets: Cash equivalents $ 49,034 $ 49,034 $ — $ — Marketable securities $ 10,000 $ 10,000 $ — $ — Derivative liabilities: Warrants $ 556 $ — $ — $ 556 Total Carrying Value Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) March 31, 2019: Assets: Cash equivalents $ 41,839 $ 41,839 $ — $ — Derivative liabilities: Warrants $ 4,942 $ — $ — $ 4,942
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]	Warrants April 1, 2019 $ 4,942 Mark to market adjustment (4,092 ) Warrant exercise (294 ) Balance at September 30, 2019 $ 556 Warrants April 1, 2018 $ 1,217 Mark to market adjustment 182 Balance at September 30, 2018 $ 1,399

Note 7 - Accounts Receivable (T

Note 7 - Accounts Receivable (Tables)	6 Months Ended
	Sep. 30, 2019
Notes Tables
Accounts Receivable [Table Text Block]	September 30, 2019 March 31, 2019 Accounts receivable (billed) $ 6,079 $ 5,642 Accounts receivable (unbilled) 3,994 2,213 Accounts receivable, net $ 10,073 $ 7,855

Note 8 - Inventory (Tables)

Note 8 - Inventory (Tables)	6 Months Ended
	Sep. 30, 2019
Notes Tables
Schedule of Inventory, Current [Table Text Block]	September 30, 2019 March 31, 2019 Raw materials $ 7,421 $ 5,474 Work-in-process 1,943 1,922 Finished goods 3,981 4,405 Deferred program costs 2,152 318 Net inventory $ 15,497 $ 12,119

Note 9 - Note Receivable (Table

Note 9 - Note Receivable (Tables)	6 Months Ended
	Sep. 30, 2019
Notes Tables
Notes Receivable [Table Text Block]	Current assets September 30, 2019 March 31, 2019 Note receivable, current $ — $ 3,000 Note receivable discount — (112 ) Total current note receivable $ — $ 2,888

Note 10 - Property, Plant and_2

Note 10 - Property, Plant and Equipment (Tables)	6 Months Ended
	Sep. 30, 2019
Notes Tables
Property, Plant and Equipment [Table Text Block]	September 30, 2019 March 31, 2019 Construction in progress - equipment $ 2,223 $ 603 Equipment and software 45,127 45,705 Furniture and fixtures 1,259 1,269 Leasehold improvements 1,976 1,955 Property, plant and equipment, gross 50,585 49,532 Less accumulated depreciation (41,975 ) (40,560 ) Property, plant and equipment, net $ 8,610 $ 8,972

Note 11 - Accounts Payable an_2

Note 11 - Accounts Payable and Accrued Expenses (Tables)	6 Months Ended
	Sep. 30, 2019
Notes Tables
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]	September 30, 2019 March 31, 2019 Accounts payable $ 6,164 $ 2,939 Accrued inventories in-transit 603 244 Accrued other miscellaneous expenses 1,772 1,759 Advanced deposits 1,771 631 Accrued compensation 3,730 5,404 Income taxes payable 3,043 3,363 Accrued product warranty 1,641 1,545 Total $ 18,724 $ 15,885
Schedule of Product Warranty Liability [Table Text Block]	Three Months Ended September 30, Six Months Ended September 30, 2019 2018 2019 2018 Balance at beginning of period $ 1,606 $ 1,752 $ 1,545 $ 1,769 Change in accruals for warranties during the period 71 213 156 317 Settlements during the period (36 ) (205 ) (60 ) (326 ) Balance at end of period $ 1,641 $ 1,760 $ 1,641 $ 1,760

Note 13 - Warrants and Deriva_2

Note 13 - Warrants and Derivative Liabilities (Tables)	6 Months Ended
	Sep. 30, 2019
Notes Tables
Fair Value Option, Disclosures [Table Text Block]	September 30, June 30, Fiscal Year 2019 2019 2019 Risk-free interest rate 1.90 % 2.11 % Expected annual dividend yield — — Expected volatility 62.84 % 60.58 % Term (years) 0.12 0.37 Fair value $0.6 million $1.7 million March 31, December 31, September 30, June 30, March 31, Fiscal Year 2018 2019 2018 2018 2018 2018 Risk-free interest rate 2.43% 2.61% 2.62% 2.40% 2.20% Expected annual dividend yield — — — — — Expected volatility 75.61% 70.29% 63.66% 67.40% 65.86% Term (years) 0.62 0.87 1.12 1.37 1.62 Fair value $4.6 million $3.6 million $1.3 million $1.6 million $1.1 million

Note 14 - Leases (Tables)

Note 14 - Leases (Tables)	6 Months Ended
	Sep. 30, 2019
Notes Tables
Assets And Liabilities Lessee [Table Text Block]	September 30, 2019 Operating Leases: Right-of-use assets $ 3,607 Total right-of-use assets 3,607 Lease liabilities - ST $ 424 Lease liabilities - LT 3,240 Total operating lease liabilities 3,664 Weighted-average remaining lease term 7.31 years Weighted-average discount rate 7.07 %
Lease, Cost [Table Text Block]	Three Months Ended Six Months Ended September 30, 2019 September 30, 2019 Operating Lease: Operating lease costs - fixed $ 178 $ 356 Operating lease costs - variable 27 46 Short-term lease costs 176 214 Total lease costs 381 616
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	Operating Leases Year ended March 31, 2020 $ 331 2021 670 2022 650 2023 624 2024 562 Thereafter 1,896 Total minimum lease payments 4,733 Less: interest (1,069 ) Present value of lease liabilities 3,664
Accounting Standards Update 2016-02 [Member]
Notes Tables
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]	March 31, 2019 ASC 842 Adjustment April 1, 2019 Operating Leases: Right of use asset $ — $ 3,795 $ 3,795 Total operating lease right-of-use asset — 3,795 3,795 Operating lease liabilities – ST $ — $ 309 $ 309 Operating lease liabilities – LT — 3,512 3,512 Total operating lease liabilities — 3,821 3,821 Weighted-average remaining lease term 7.69 years Weighted-average discount rate 7.06 %

Note 16 - Restructuring (Tables

Note 16 - Restructuring (Tables)	6 Months Ended
	Sep. 30, 2019
Notes Tables
Restructuring and Related Costs [Table Text Block]	Severance pay Facility exit and and benefits Relocation costs Total Accrued restructuring balance at April 1, 2018 $ 262 $ 173 $ 435 Charges to operations — 403 403 Cash payments (173 ) (576 ) (749 ) Accrued restructuring balance at September 30, 2018 $ 89 $ — $ 89

Note 17 - Business Segments (Ta

Note 17 - Business Segments (Tables)	6 Months Ended
	Sep. 30, 2019
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Three Months Ended September 30, Six Months Ended September 30, 2019 2018 2019 2018 Revenues: Grid $ 11,489 $ 7,569 $ 21,345 $ 16,498 Wind 2,523 7,307 6,437 10,985 Total $ 14,012 $ 14,876 $ 27,782 $ 27,483 Three Months Ended September 30, Six Months Ended September 30, 2019 2018 2019 2018 Operating (loss) income: Grid $ (1,324 ) $ (2,870 ) $ (5,988 ) $ (5,537 ) Wind (2,398 ) 28,515 (3,721 ) 27,150 Unallocated corporate expenses (397 ) (918 ) (646 ) (2,013 ) Total $ (4,119 ) $ 24,727 $ (10,355 ) $ 19,600
Reconciliation of Assets from Segment to Consolidated [Table Text Block]	September 30, 2019 March 31, 2019 Grid $ 34,479 $ 31,075 Wind 12,474 8,167 Corporate assets 70,490 80,088 Total $ 117,443 $ 119,330

Note 1 - Nature of the Busine_2

Note 1 - Nature of the Business and Operations and Liquidity (Details Textual) $ in Thousands

May 23, 2019USD ($)

Mar. 28, 2019USD ($)

Jul. 04, 2018USD ($)

Jul. 03, 2018USD ($)

Feb. 01, 2018USD ($)

Dec. 31, 2015USD ($)

Sep. 30, 2019USD ($)

Sep. 30, 2018USD ($)

Sep. 30, 2019USD ($)

Sep. 30, 2018USD ($)

Mar. 31, 2019USD ($)

Dec. 27, 2018USD ($)

Mar. 28, 2018USD ($)

Retained Earnings (Accumulated Deficit), Ending Balance

$ (965,903)

$ (965,903)

$ (961,539)

Cash, Cash Equivalents, and Marketable Securities

62,800

62,800

Net Cash Provided by (Used in) Operating Activities, Total

(10,485)

$ 23,595

Gain (Loss) Related to Litigation Settlement, Total

$ 0

$ 28,720

$ 0

$ 28,720

Sinovel [Member]

Litigation Settlement, Amount Awarded from Other Party

$ 57,500

Litigation Settlement, Number of Installments

2

Proceeds from Legal Settlements

$ 32,500

Litigation Receivable

$ 25,000

Gain (Loss) Related to Litigation Settlement, Total

$ 52,700

64 Jackson, LLC [Member]

Purchase and Sale Agreement, Total Consideration

$ 23,000

Purchase and Sale Agreement, Proceeds from Sale of Property, Plant and Equipment

17,000

Financing Receivable, after Allowance for Credit Loss, Noncurrent, Total

$ 6,000

Purchase and Sale Agreement, Proceeds from Sale of Property, Plant and Equipment, Net

$ 16,900

Notes Receivable, Stated Interest Rate

1.96%

1.96%

Proceeds from Collection of Notes Receivable

$ 3,000

$ 3,000

Inox Wind Limited [Member]

Supply Agreement, Aggregate Value

$ 210,000

Supply Commitment, Extension Period

3 years

Certificates of Deposit [Member] | Minimum [Member]

Debt Securities, Available-for-sale, Term

1 year

1 year

Certificates of Deposit [Member] | Maximum [Member]

Debt Securities, Available-for-sale, Term

2 years

2 years

Note 2 - Revenue Recognition 1

Note 2 - Revenue Recognition 1 (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue, Performance Obligation Satisfied, Revenue Recognized, Percentage	77.00%		77.00%
Minimum [Member]
Warranty Period			1 year
Contract with Customer, Payment Term			30 days
Maximum [Member]
Warranty Period			2 years
Extended Service Warranty, Term			4 years
Contract with Customer, Payment Term			60 days
Grant [Member]
Revenues, Total	$ 700	$ 0	$ 1,100	$ 0

Note 2 - Revenue Recognition 2

Note 2 - Revenue Recognition 2 (Details Textual) $ in Thousands	Sep. 30, 2019USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Amount	$ 50,400
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue, Remaining Performance Obligation, Amount	$ 7,200
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01 | Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year 30 days
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01 | Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	5 years

Note 2 - Revenue Recognition -

Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues	$ 14,012	$ 14,876	$ 27,782	$ 27,483
Grid [Member]
Revenues	11,489	7,569	21,345	16,498
Grid [Member] | Americas [Member]
Revenues	10,698	5,052	18,499	12,548
Grid [Member] | Asia Pacific [Member]
Revenues	393	2,308	2,220	3,115
Grid [Member] | EMEA [Member]
Revenues	398	209	626	835
Wind [Member]
Revenues	2,523	7,307	6,437	10,985
Wind [Member] | Americas [Member]
Revenues	1	24	47	47
Wind [Member] | Asia Pacific [Member]
Revenues	2,464	7,278	6,320	10,873
Wind [Member] | EMEA [Member]
Revenues	58	5	70	65
Equipment and Systems [Member] | Grid [Member]
Revenues	10,044	5,503	18,399	12,957
Equipment and Systems [Member] | Wind [Member]
Revenues	2,077	7,219	5,581	10,711
Services and Technology Development [Member] | Grid [Member]
Revenues	1,445	2,066	2,946	3,541
Services and Technology Development [Member] | Wind [Member]
Revenues	$ 446	$ 88	$ 856	$ 274

Note 2 - Revenue Recognition _2

Note 2 - Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Unbilled AR, beginning balance	$ 2,213	$ 3,016
Deferred Program Costs, beginning balance	318	2,567
Contract Liabilities, beginning balance	15,519	21,937
Deferred Program Costs, increases for costs incurred to fulfill performance obligations	2,153	1,267
Unbilled AR, increase (decrease) due to customer billings	(2,926)	(7,886)
Increase (decrease) due to customer billings	19,340	7,828
Unbilled AR,Decrease due to cost recognition on completed performance obligations
Deferred Program Costs, decrease due to cost recognition on completed performance obligations	(310)	(1,033)
Unbilled AR, increase (decrease) due to recognition of revenue based on transfer of control of performance obligations	4,711	7,439
Deferred Program Costs, increase (decrease) due to recognition of revenue based on transfer of control of performance obligations		(9)
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations	(18,534)	(8,296)
Unbilled AR, other changes and FX impact	(4)	(19)
Deferred Program Costs, other changes and FX impact	(9)	24
Other changes and FX impact	(313)	(864)
Unbilled AR, impact of adoption of ASC 606
Deferred Program Costs, impact of adoption of ASC 606		(1,599)
Contract Liabilities, impact of adoption of ASC 606		(2,657)
Unbilled AR, ending balance	3,994	2,550
Deferred Program Costs, ending balance	2,152	1,217
Contract Liabilities, ending balance	$ 16,012	$ 17,948

Note 2 - Revenue Recognition _3

Note 2 - Revenue Recognition - Revenues By Major Customers (Details) - Customer Concentration Risk [Member] - Revenue Benchmark [Member]	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Wind [Member] | Inox Wind Limited [Member]
Concentration risk percentage		45.00%	17.00%	36.00%
Grid [Member] | Micron Technology [Member]
Concentration risk percentage			14.00%
Grid [Member] | Vestas WTG Mexico [Member]
Concentration risk percentage		11.00%		23.00%
Grid [Member] | Quanta Power [Member]
Concentration risk percentage	0.00%	12.00%	0.00%
Grid [Member] | Hoffman Construction [Member]
Concentration risk percentage	25.00%	0.00%	12.00%	0.00%
Grid [Member] | M.J. Electric, LLC [Member]
Concentration risk percentage	25.00%	0.00%	13.00%	0.00%

Note 3 - Stock-based Compensa_3

Note 3 - Stock-based Compensation (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	0	5,939	0
Restricted Stock [Member]
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total			170,500	413,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 3.1		$ 3.1
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			1 year 146 days
Restricted Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			2 years
Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	2 years		2 years
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 0.1		$ 0.1
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			1 year 255 days
Common Stock [Member]
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total			13,174	37,075

Note 3 - Stock-based Compensa_4

Note 3 - Stock-based Compensation - Stock-based Compensation Expense By Financial Statement Line Item (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Total stock-based compensation expense	$ 397	$ 825	$ 646	$ 1,610
Cost of Sales [Member]
Total stock-based compensation expense	21	50	24	90
Research and Development Expense [Member]
Total stock-based compensation expense	92	70	103	121
Selling, General and Administrative Expenses [Member]
Total stock-based compensation expense	$ 283	$ 705	$ 519	$ 1,399

Note 3 - Stock-based Compensa_5

Note 3 - Stock-based Compensation - Black Scholes Valuation (Details)	6 Months Ended
	Sep. 30, 2019
Expected volatility	66.50%
Risk-free interest rate	1.80%
Expected life (years) (Year)	5 years 332 days
Dividend yield	0.00%

Note 4 - Computation of Net L_3

Note 4 - Computation of Net Loss per Common Share (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	200,000	1,600,000	1,000,000	1,400,000
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants	67,000	0	150,000	0
Fair Value Adjustment of Warrants	$ (1,145)		$ (4,092)	$ 182
Hudson Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	818,181		818,181
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 7.81		$ 7.81
Average Common Stock Price	$ 8.50		$ 9.56
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants	66,638		150,025
Fair Value Adjustment of Warrants	$ (1,100)		$ (4,100)
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		300,000	200,000	200,000
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	800,000	900,000		900,000
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		400,000		300,000

Note 4 - Computation of Net L_4

Note 4 - Computation of Net Loss per Common Share - Reconciliation of Numerators and Denominators of EPS Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net (loss) income	$ (825)	$ 22,558	$ (4,364)	$ 17,821
Fair Value Adjustment of Warrants	(1,145)		(4,092)	182
Plus: change in fair value due to exercise of warrants	0	0	83	0
Net income (loss) - diluted	$ (1,970)	$ 22,558	$ (8,373)	$ 17,821
Denominator:
Weighted-average shares of common stock outstanding (in shares)	21,678	21,252	21,538	21,126
Weighted-average shares subject to repurchase (in shares)	(1,022)	(939)	(952)	(886)
Shares used in per-share calculation - basic (in shares)	20,656	20,313	20,586	20,240
Common stock awards (in shares)	0	268	0	320
Common stock warrants (in shares)	67	0	150	0
Shares used in per-share calculation - diluted (in shares)	20,723	20,581	20,736	20,560
Net (loss) income per share - basic (in dollars per share)	$ (0.04)	$ 1.11	$ (0.21)	$ 0.88
Net (loss) income per share - diluted (in dollars per share)	$ (0.10)	$ 1.10	$ (0.40)	$ 0.87

Note 5 - Goodwill (Details Text

Note 5 - Goodwill (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Goodwill, Impairment Loss	$ 0	$ 0

Note 6 - Fair Value Measureme_3

Note 6 - Fair Value Measurements - Assets and Liabilities Carried at Fair Value on a Recurring Basis (Details) - USD ($)	Sep. 30, 2019	Mar. 31, 2019
Derivative liabilities	$ 556,000	$ 4,942,000
Reported Value Measurement [Member] | Fair Value, Recurring [Member]
Cash equivalents	49,034,000	41,839,000
Marketable securities	10,000
Reported Value Measurement [Member] | Fair Value, Recurring [Member] | Warrant [Member]
Derivative liabilities	556,000	4,942,000
Reported Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents	49,034,000	41,839,000
Marketable securities	10,000
Derivative liabilities	0	0
Reported Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Cash equivalents	0
Marketable securities
Derivative liabilities	0	0
Reported Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Cash equivalents	0
Marketable securities
Derivative liabilities	$ 556,000	$ 4,942,000

Note 6 - Fair Value Measureme_4

Note 6 - Fair Value Measurements - Liabilities Measured at Fair Value on a Recurring Basis (Details) - Warrant Liability [Member] - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Beginning balance	$ 4,942	$ 1,217
Mark to market adjustment	(4,092)	182
Warrant exercise	(294)
Ending balance	$ 556	$ 1,399

Note 7 - Accounts Receivable -

Note 7 - Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Accounts receivable (billed)	$ 6,079	$ 5,642
Accounts receivable (unbilled)	3,994	2,213
Accounts receivable, net	$ 10,073	$ 7,855

Note 8 - Inventory (Details Tex

Note 8 - Inventory (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Inventory Write-down	$ 100	$ 400	$ 196	$ 514

Note 8 - Inventory - Summary of

Note 8 - Inventory - Summary of Net Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Raw materials	$ 7,421	$ 5,474
Work-in-process	1,943	1,922
Finished goods	3,981	4,405
Deferred program costs	2,152	318
Net inventory	$ 15,497	$ 12,119

Note 9 - Note Receivable (Detai

Note 9 - Note Receivable (Details Textual) - 64 Jackson, LLC [Member] $ in Millions	Feb. 01, 2018USD ($)	Sep. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Mar. 28, 2018
Purchase and Sale Agreement, Total Consideration	$ 23
Security Deposit	1
Financing Receivable, after Allowance for Credit Loss, Noncurrent, Total	$ 6
Notes and Loans Receivable, Number of Installments			2
Notes and Loans Receivable, Installment Amount			$ 3
Notes Receivable, Stated Interest Rate			1.96%	1.96%
Notes Receivable, Fair Value Disclosure		$ 5.7
Note Receivable Discount Rate		6.00%
Notes and Loans Receivable, Noncurrent Portion of Unamortized Debt Discount		$ 0.3
Deferred Gain on Sale of Property		$ 0.1

Note 9 - Note Receivable - Summ

Note 9 - Note Receivable - Summary of Note Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Note receivable, current		$ 3,000
Note receivable discount		(112)
Total current note receivable		$ 2,888

Note 10 - Property, Plant and_3

Note 10 - Property, Plant and Equipment (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Depreciation, Depletion and Amortization, Total	$ 1	$ 1.1	$ 2.1	$ 2.1

Note 10 - Property, Plant and_4

Note 10 - Property, Plant and Equipment - Cost and Accumulated Depreciation of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Property, plant and equipment, gross	$ 50,585	$ 49,532
Less accumulated depreciation	(41,975)	(40,560)
Property, plant and equipment, net	8,610	8,972
Construction in Progress [Member]
Property, plant and equipment, gross	2,223	603
Equipment and Software [Member]
Property, plant and equipment, gross	45,127	45,705
Furniture and Fixtures [Member]
Property, plant and equipment, gross	1,259	1,269
Leasehold Improvements [Member]
Property, plant and equipment, gross	$ 1,976	$ 1,955

Note 11 - Accounts Payable an_3

Note 11 - Accounts Payable and Accrued Expenses (Details Textual)	6 Months Ended
	Sep. 30, 2019
Minimum [Member]
Extended Warranty Trigger Period	1 year
Maximum [Member]
Extended Warranty Trigger Period	3 years

Note 11 - Accounts Payable an_4

Note 11 - Accounts Payable and Accrued Expenses - Summary of Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Accounts payable	$ 6,164	$ 2,939
Accrued inventories in-transit	603	244
Accrued other miscellaneous expenses	1,772	1,759
Advanced deposits	1,771	631
Accrued compensation	3,730	5,404
Income taxes payable	3,043	3,363
Accrued product warranty	1,641	1,545
Total	$ 18,724	$ 15,885

Note 11 - Accounts Payable an_5

Note 11 - Accounts Payable and Accrued Expenses - Product Warranty Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Balance at beginning of period	$ 1,606	$ 1,752	$ 1,545	$ 1,769
Change in accruals for warranties during the period	71	213	156	317
Settlements during the period	(36)	(205)	(60)	(326)
Balance at end of period	$ 1,641	$ 1,760	$ 1,641	$ 1,760

Note 12 - Income Taxes (Details

Note 12 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Income Tax Expense (Benefit), Total	$ (294)	$ 3,008	$ (83)	$ 2,964
Liability for Uncertainty in Income Taxes, Current	$ 0		$ 0
Unrecognized Tax Benefits, Ending Balance					$ 0

Note 13 - Warrants and Deriva_3

Note 13 - Warrants and Derivative Liabilities (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	Apr. 17, 2019	Dec. 19, 2014	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019	Nov. 13, 2014
Gain (Loss) in Change of Fair Value of Derivative Instruments and Warrants			$ 1,145	$ 282	$ 4,092	$ (182)
Hercules Warrants [Member]
Gain (Loss) on Decrease Fair Value Upon Exercise of Warrant					$ 100
November 2014 Warrant [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights								$ 7.81
Common Unit, Issued								909,090
Common Shares Per Unit								1
Class of Warrant or Right, Number of Warrants to Purchase One Share of Stock								0.9
Class of Warrant or Right, Number of Securities Called by Warrants or Rights								818,181
Warrants and Rights Outstanding, Maturity Date								Nov. 13, 2019
Hercules Technology Growth Capital [Member]
Stock Issued During Period, Shares, Warrant Exercised	22,821
Secured Debt [Member] | Hercules Technology Growth Capital [Member] | Hercules Warrants [Member]
Purchase Commitment, Issuance of Warrants, Shares of Common Stock		58,823
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 7.85		$ 7.85
Derivative, Fair Value, Net, Total							$ 400

Note 13 - Warrants and Deriva_4

Note 13 - Warrants and Derivative Liabilities - Summary of the Key Assumptions Used to Calculate Fair Value of Warrants (Details) $ in Millions	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)yr	Dec. 31, 2018USD ($)yr	Sep. 30, 2018USD ($)yr	Jun. 30, 2018USD ($)yr	Mar. 31, 2018USD ($)yr
Fair value	$ 0.6	$ 1.7	$ 4.6	$ 3.6	$ 1.3	$ 1.6	$ 1.1
Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0.019	0.0211	0.0243	0.0261	0.0262	0.024	0.022
Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input
Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input	0.6284	0.6058	0.7561	0.7029	0.6366	0.674	0.6586
Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input	0.12	0.37	0.62	0.87	1.12	1.37	1.62

Note 14 - Leases (Details Textu

Note 14 - Leases (Details Textual) - USD ($) $ in Thousands	Apr. 01, 2019	Sep. 30, 2019	Mar. 31, 2019
Operating Lease, Right-of-Use Asset	$ 3,795	$ 3,607	$ 0
Operating Lease, Liability, Total	3,821	$ 3,664
Maximum [Member]
Lessee, Operating Lease, Renewal Term		5 years
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset	3,800		3,795
Operating Lease, Liability, Total	3,800		$ 3,821
Operating Lease, Impairment Loss	$ 0

Note 14 - Leases - Adoption of

Note 14 - Leases - Adoption of ASC 842 (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Apr. 01, 2019	Mar. 31, 2019
Right-of-use asset	$ 3,607	$ 3,795	$ 0
Lease liability, current portion	424	309	0
Lease liability, long term portion	3,240	3,512	$ 0
Total operating lease liabilities	$ 3,664	$ 3,821
Weighted-average remaining lease term (Year)	7 years 113 days	7 years 251 days
Weighted-average discount rate	7.07%	7.06%
Accounting Standards Update 2016-02 [Member]
Right-of-use asset		$ 3,800	$ 3,795
Lease liability, current portion			309
Lease liability, long term portion			3,512
Total operating lease liabilities		$ 3,800	$ 3,821
Weighted-average remaining lease term (Year)
Weighted-average discount rate
Previous Accounting Guidance [Member]
Right-of-use asset
Lease liability, current portion
Lease liability, long term portion
Total operating lease liabilities

Note 14 - Leases - Operating Le

Note 14 - Leases - Operating Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Apr. 01, 2019	Mar. 31, 2019
Right-of-use asset	$ 3,607	$ 3,795	$ 0
Lease liability, current portion	424	309	0
Lease liability, long term portion	3,240	3,512	$ 0
Total operating lease liabilities	$ 3,664	$ 3,821
Weighted-average remaining lease term (Year)	7 years 113 days	7 years 251 days
Weighted-average discount rate	7.07%	7.06%

Note 14 - Leases - Lease Cost (

Note 14 - Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Operating lease costs - fixed	$ 178	$ 356
Operating lease costs - variable	27	46
Short-term lease costs	176	214
Total lease costs	$ 381	$ 616

Note 14 - Leases - Minimum Futu

Note 14 - Leases - Minimum Future Lease Obligation (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Apr. 01, 2019
2020	$ 331
2021	670
2022	650
2023	624
2024	562
Thereafter	1,896
Total minimum lease payments	4,733
Less: interest	(1,069)
Total operating lease liabilities	$ 3,664	$ 3,821

Note 15 - Commitments and Con_2

Note 15 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2019	Jul. 01, 2019	Mar. 31, 2019
Restricted Cash and Cash Equivalents, Noncurrent, Total	$ 5,736		$ 715
Letter of Credit [Member]
Escrow Deposit		$ 5,000

Note 16 - Restructuring (Detail

Note 16 - Restructuring (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Charges, Total	$ 0	$ 93	$ 0	$ 403

Note 16 - Restructuring - Restr

Note 16 - Restructuring - Restructuring Charges and Cash Payments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accrued restructuring balance, beginning				$ 435
Restructuring Charges, Total	$ 0	$ 93	$ 0	403
Cash payments				(749)
Accrued restructuring balance, ending		89		89
Employee Severance Pay and Benefits [Member]
Accrued restructuring balance, beginning				262
Restructuring Charges, Total
Cash payments				(173)
Accrued restructuring balance, ending		89		89
Facility Exit and Relocation Costs [Member]
Accrued restructuring balance, beginning				173
Restructuring Charges, Total				403
Cash payments				(576)
Accrued restructuring balance, ending

Note 17 - Business Segments (De

Note 17 - Business Segments (Details Textual) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)MWh	Sep. 30, 2018USD ($)
Number of Reportable Segments			2
Share-based Payment Arrangement, Expense	$ 397	$ 825	$ 646	$ 1,610
Restructuring Charges, Total	0	93	0	403
Corporate, Non-Segment [Member]
Share-based Payment Arrangement, Expense	$ 400	800	$ 600	1,600
Restructuring Charges, Total		$ 100		$ 400
Minimum [Member]
Power of Wind Turbines | MWh			2

Note 17 - Business Segments - O

Note 17 - Business Segments - Operating Results for Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues	$ 14,012	$ 14,876	$ 27,782	$ 27,483
Operating profit (loss)	(4,119)	24,727	(10,355)	19,600
Corporate, Non-Segment [Member]
Operating profit (loss)	(397)	(918)	(646)	(2,013)
Grid [Member]
Revenues	11,489	7,569	21,345	16,498
Grid [Member] | Operating Segments [Member]
Operating profit (loss)	(1,324)	(2,870)	(5,988)	(5,537)
Wind [Member]
Revenues	2,523	7,307	6,437	10,985
Wind [Member] | Operating Segments [Member]
Operating profit (loss)	$ (2,398)	$ 28,515	$ (3,721)	$ 27,150

Note 17 - Business Segments - T

Note 17 - Business Segments - Total Business Segments Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Total assets	$ 117,443	$ 119,330
Operating Segments [Member] | Grid [Member]
Total assets	34,479	31,075
Operating Segments [Member] | Wind [Member]
Total assets	12,474	8,167
Corporate, Non-Segment [Member]
Total assets	$ 70,490	$ 80,088