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Acquisition (Details) - USD ($) |  | 9 Months Ended
--- | --- | ---
Dec. 21, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquistion [Abstract] |  |  |
Goodwill acquired |  | $ 851,000 | $ 0
Developed Technology [Member] |  |  |
Business Acquistion [Abstract] |  |  |
Estimated useful life |  | 5 years |
Customer Relationships [Member] |  |  |
Business Acquistion [Abstract] |  |  |
Estimated useful life |  | 11 years |
Order Backlog [Member] |  |  |
Business Acquistion [Abstract] |  |  |
Estimated useful life |  | 6 months |
Mechanical Power Conversion, LLC [Member] |  |  |
Business Acquistion [Abstract] |  |  |
Cash purchase price | $ 4,417,000 |  |
Cash held in escrow account | 360,000 |  |
Aggregate contingent consideration obligation | 5,200,000 |  |
Preliminary fair value of contingent consideration obligations | 3,560,000 |  |
Inventory | 1,683,000 |  |
Other net liabilities | 217,000 |  |
Goodwill acquired | $ 851,000 |  |
Acquisition costs |  | $ 287,000 |
Mechanical Power Conversion, LLC [Member] | Minimum [Member] |  |  |
Business Acquistion [Abstract] |  |  |
Contingent consideration payment period | 2 years |  |
Mechanical Power Conversion, LLC [Member] | Maximum [Member] |  |  |
Business Acquistion [Abstract] |  |  |
Contingent consideration payment period | 3 years |  |
Mechanical Power Conversion, LLC [Member] | Developed Technology [Member] |  |  |
Business Acquistion [Abstract] |  |  |
Finite-lived intangible assets acquired | $ 2,660,000 |  |
Estimated useful life |  | 5 years |
Mechanical Power Conversion, LLC [Member] | Customer Relationships [Member] |  |  |
Business Acquistion [Abstract] |  |  |
Finite-lived intangible assets acquired | 2,630,000 |  |
Estimated useful life |  | 8 years |
Mechanical Power Conversion, LLC [Member] | Order Backlog [Member] |  |  |
Business Acquistion [Abstract] |  |  |
Finite-lived intangible assets acquired | $ 370,000 |  |
Estimated useful life |  | 6 months |

X
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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