Annual Retainer Fee

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- Definition

Cumulative budgeted net sales target measurement period.

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No definition available.

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- Definition

Cash paid to each non-employee director for each board meeting attended.

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- Definition

Annual cash retainer provided to each non-employee director.

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No definition available.

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- Definition

Maximum disposal restriction as percentage of restricted stock units.

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- Definition

Non Employee Director Number Of Restricted Stocks Received

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No definition available.

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- Definition

Non employee director received restricted stock award shares.

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- Definition

Non employee director received restricted stock award value.

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- Definition

Number Of Equity Incentive Plans

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- Definition

Percentage of shares granted.

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No definition available.

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- Definition

Reservation of shares under employee stock purchase plan.

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No definition available.

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- Definition

Restricted stock unit vested percentage on anniversary of the grant date provided the grantee is employed by the company and the company achieves specific thresholds of net sales and annual operating income.

+ References

No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Number Of Annual Installments

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No definition available.

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- Definition

Share based compensation arrangements by share based payments award expiration period.

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No definition available.

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- Definition

Share based compensation expense payments remainder of fiscal year.

+ References

No definition available.

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- Definition

Share based compensation expense payments rolling year three.

+ References

No definition available.

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- Definition

Share based compensation expense payments rolling year two.

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No definition available.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

No definition available.

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

No definition available.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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- Definition

Discount rate from fair value on purchase date that participants pay for shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

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- Definition

Number of shares for which recognition of compensation cost was accelerated.

+ References

No definition available.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Share-Based Compensation - Additional Information (Detail)				1 Months Ended				3 Months Ended		12 Months Ended
	Aug. 01, 2016 USD ($) shares	May 18, 2016 shares	Feb. 01, 2014 shares	May 31, 2016 Installment shares	Mar. 31, 2016 Installment shares	May 31, 2015 Installment shares	Mar. 31, 2015 Installment shares	Jul. 30, 2016 shares	Aug. 01, 2015 USD ($)	Jan. 31, 2017 USD ($) Equity_Plan $ / shares shares	Jan. 31, 2016 $ / shares shares	Jan. 31, 2015 $ / shares shares	Apr. 30, 2017 shares	Apr. 30, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity incentive plan \| Equity_Plan										2
Number of options granted										122,000	115,000	158,600
Non-employee director is entitled to an annual cash retainer \| $									$ 7,000
Non-employee director received restricted stock award value \| $										$ 20,000
Non-employee director received restricted stock award shares								8,262
Maximum disposal restricted percentage of RSU										50.00%
Options granted weighted-average fair value per share \| $ / shares										$ 3.22	$ 2.43	$ 2.85
Aggregate intrinsic value of options exercised \| $										$ 600,000
Reservation of shares under Stock Purchase Plan										247,500
2007 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive plan, expiration period										2017-05
Shares available for grant under the Plan										87,989
2015 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive plan, expiration period										2025-05
Shares available for grant under the Plan										151,987
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Stock Purchase Plan discount rate										15.00%
Non-Employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-employee director is entitled to an annual cash retainer additional \| $									500
Granting percentage of shares	25.00%
Director compensation amount, remainder of fiscal 2017 \| $	$ 55,000
Director compensation amount, fiscal 2018 \| $	65,000
Director compensation amount, fiscal 2019 \| $	75,000
Chairman of Board [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of Chair Retainer payable \| $									6,000
Non-employee director received restricted stock award value \| $	6,000
Chairs of Audit and Compensation Committees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-employee director received restricted stock award value \| $	$ 4,000
Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted					50,000		50,000
Chief Executive Officer [Member] \| 2007 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant under the Plan										500,000
Chief Executive Officer [Member] \| Maximum [Member] \| 2007 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares of common stock of the Company authorized for issuance										50,000
Other Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted							35,000
Chair of Audit Committee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of Chair Retainer payable \| $									4,000
Chair of Compensation Committee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of Chair Retainer payable \| $									$ 4,000
Certain Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted				37,000
Chief Financial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted	5,000
Equity Incentive Plan [Member] \| Non-Employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option expiration period										10 years
Number of options granted		30,000								5,000
Number of stock options grant to each non-employee director										1,168	2,947
RSA [Member] \| Non-Employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period										12 months
RSA [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stocks, granted					4,030		537
Restricted Stock And Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of annual vesting installments \| Installment					4		4
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of annual vesting installments \| Installment				4
Unrecognized compensation expense related to options \| $										$ 500,000
Unrecognized compensation expense to be recognized, Weighted average period										2 years 3 months 18 days
Aggregate intrinsic value of option exercised \| $										$ 1,400,000
Aggregate intrinsic value of the options outstanding \| $										$ 1,500,000
Stock Options [Member] \| 2007 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period										4 years
Option expiration period										10 years
Stock Options [Member] \| 2015 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period										4 years
Option expiration period										10 years
2014 Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of accelerated vesting shares			4,166
Number of vesting shares														9,300
Unrecognized compensation expense to be recognized, Weighted average period										2 years 1 month 6 days
Unrecognized compensation expense related to RSUs and RSAs \| $										$ 900,000
2014 Restricted Stock Units (RSUs) [Member] \| Third Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of vesting shares														9,300
2014 Restricted Stock Units (RSUs) [Member] \| Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative budgeted net sales target measurement period										2014 through 2016
2014 Restricted Stock Units (RSUs) [Member] \| Officer [Member] \| Net Sales Target [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock unit vested percentage										50.00%
2014 Restricted Stock Units (RSUs) [Member] \| Officer [Member] \| ORONA Target [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock unit vested percentage										25.00%
2014 Restricted Stock Units (RSUs) [Member] \| Officer [Member] \| Third Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock unit vested percentage										25.00%
Time Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stocks, granted						80,000
Number of annual vesting installments \| Installment						4
Performance Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						3 years
Restricted stocks, granted						155,000
Performance Based Restricted Stock Units RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of vesting shares													9,025	15,810