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Lines of Credit - Narrative (Detail)	3 Months Ended
	Aug. 04, 2019 USD ($)	Aug. 04, 2019 CNY (¥)	Apr. 28, 2019 USD ($)		Feb. 07, 2019 USD ($)	Jul. 29, 2018 USD ($)
Line of Credit Facility [Line Items]
Outstanding amount						$ 4,000,000
subordinated loan outstanding amount	$ 925,000		$ 675,000	[1]
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
subordinated loan outstanding amount	$ 925,000		675,000
Revolving Credit Facility [Member] | Subordinated Debt [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity					$ 1,000,000
Expiration date	Jun. 22, 2023
Applicable interest rate at end of period	3.68%	3.68%
subordinated loan commitment initiation date	Feb. 07, 2019
United States [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 25,000,000
Maximum amount of letters of credit	1,000,000
Letters of credit, outstanding amount	$ 250,000		$ 250,000			$ 250,000
Expiration date	Aug. 15, 2020
Interest rate description	Interest was charged at a rate as a variable spread over LIBOR based on our ratio of debt to EBITDA.
Applicable interest rate at end of period	3.68%	3.68%	3.93%			3.53%
Reference rate on which the interest rate is based	LIBOR
Percentage of common stock in subsidiary pledge as collateral	65.00%
Outstanding amount	$ 0		$ 0			$ 4,000,000
China [Member] | Revolving credit agreement [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 5,800,000	¥ 40,000,000
Expiration date	Jan. 31, 2020
Interest rate description	This agreement has an interest rate determined by the Chinese government
Outstanding amount	$ 0		$ 0			$ 0
[1] Derived from audited financial statements.

X

- Definition

The percentage of equity interest pledge as collateral under the credit agreement.

+ References

No definition available.

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- Definition

Amount represents maximum amount of letters of credit that can be issued.

+ References

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X

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

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X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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X

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
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- Definition

Date the credit facility first became available, in CCYY-MM-DD format.

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X

- Definition

The effective interest rate at the end of the reporting period.

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- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

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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

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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X

- Definition

The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Carrying value as of the balance sheet date of collateralized/uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Subordinated debt places a lender in a lien position behind the primary lender of the company.

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