Allocation of Purchase Price [Abstract]

No definition available.

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- Definition

Business Combination, Consideration Transferred, Accounts Receivable Forgiven

+ References

No definition available.

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets

+ References

No definition available.

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- Definition

Purchase Price [Abstract]

+ References

No definition available.

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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
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- Definition

Amount of assets acquired at the acquisition date.

+ References

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- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

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-SubTopic 10
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- Definition

The amount of inventory recognized as of the acquisition date.

+ References

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

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-Publisher FASB
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-Section 45
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-Subparagraph (b)
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- Definition

Number of shares of stock issued during the period pursuant to acquisitions.

+ References

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- Definition

Value of stock issued pursuant to acquisitions during the period.

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Acquisition of Assets (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
Acquisition of Assets (Details) - USD ($) $ in Thousands	Feb. 28, 2018	Apr. 30, 2018	Apr. 30, 2017
Purchase Price:
Cash		$ 3,000	$ 0
Hydroscience
Purchase Price:
Cash	$ 3,000
Release of claims against Hydroscience	1,144
Transaction costs	312
Total purchase price	4,456
Allocation of purchase price:
Inventory	206
Tangible assets (mainly manufacturing equipment)	350
Intangible assets (including patents, designs & software)	3,900
Total purchase price	$ 4,456
Preferred Stock
Allocation of purchase price:
Stock issued during period (in shares)	152,290
Value of shares issued	$ 3,500