Debt instrument interest only payment term.

No definition available.

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Namespace Prefix:	sanw_
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Balance Type:	na
Period Type:	duration

- Definition

Number of promissory notes issued.

+ References

No definition available.

+ Details

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Namespace Prefix:	sanw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the debt agreement requires the first payment to be made, 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 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

+ Details

Name:	us-gaap_DebtInstrumentFrequencyOfPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

+ References

+ Details

Name:	us-gaap_DebtInstrumentMaturityDateDescription
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

+ 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 210.5-02.22(a)(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentPaymentTerms
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=sanw_SecuredPromissoryNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=sanw_SecuredRealEstateNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_LongtermDebtTypeAxis=sanw_SecuredEquipmentNoteMember
Namespace Prefix:
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Period Type:

Debt - Loan Transaction - Additional Information (Details)		1 Months Ended		6 Months Ended
	Dec. 24, 2019 USD ($)	Nov. 30, 2019 USD ($)	Nov. 30, 2017 USD ($) PromissoryNote	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Line Of Credit Facility [Line Items]
Repayments of secured debt				$ 1,147,447	$ 2,682,056
Conterra \| Secured Promissory Notes
Line Of Credit Facility [Line Items]
Gross proceeds from issuance of long term debt			$ 12,500,000
Number of promissory notes issued \| PromissoryNote			2
Conterra \| Secured Real Estate Note
Line Of Credit Facility [Line Items]
Debt instrument, principal amount			$ 10,400,000
Debt instrument, maturity date	Nov. 30, 2022
Debt instrument, maturity date, description				On December 24, 2019, the Company signed an amendment to the Note that extended the maturity date to November 30, 2022
Debt instrument, payment starting date	Jul. 01, 2020		Jul. 01, 2018
Debt instrument, interest rate			7.75%
Debt instrument, frequency of periodic payment of interest				Semi-annual payments of interest
Debt instrument, amortization schedule			20 years
Debt instrument, combined payment			$ 515,711
Debt instrument, interest only payment term				One-time interest only payment on January 1, 2018
Debt instrument, prepayment term				Pursuant to the December 2019 amendment, the Company agreed to make (i) a principal and interest payment of approximately $515,711 on January 1, 2020; (ii) five consecutive semi-annual principal and interest payments of approximately $454,185, beginning on July 1, 2020; and (iii) a one-time final payment of approximately $8,957,095 on November 30, 2022. The Company may prepay the Secured Real Estate Note, in whole or in part, at any time.
Repayments of secured debt		$ 753,120
Conterra \| Secured Real Estate Note \| Debt Instrument, Redemption, Period One
Line Of Credit Facility [Line Items]
Debt instrument, payment starting date	Jan. 01, 2020
Debt instrument, combined payment	$ 515,711
Conterra \| Secured Real Estate Note \| Debt Instrument, Redemption, Period Two
Line Of Credit Facility [Line Items]
Debt instrument, payment starting date	Jul. 01, 2020
Debt instrument, frequency of periodic payment of interest				five consecutive semi-annual principal and interest payments
Debt instrument, combined payment	$ 454,185
Conterra \| Secured Real Estate Note \| Debt Instrument, Redemption, Period Three
Line Of Credit Facility [Line Items]
Debt instrument, payment starting date	Nov. 30, 2022
Debt instrument, frequency of periodic payment of interest				one-time final payment
Debt instrument, combined payment	$ 8,957,095
Conterra \| Secured Equipment Note
Line Of Credit Facility [Line Items]
Debt instrument, principal amount			$ 2,100,000
Debt instrument, maturity date				Nov. 30, 2019
Debt instrument, maturity date, description				The Secured Equipment Note was scheduled to mature on November 30, 2019
Debt instrument, payment starting date				Jul. 01, 2018
Debt instrument, interest rate			9.50%
Debt instrument, frequency of periodic payment of interest				Semi-annual payments of interest
Debt instrument, amortization schedule			20 years
Debt instrument, combined payment			$ 118,223
Debt instrument, interest only payment term				One-time interest only payment on January 1, 2018
Debt instrument, prepayment term				The Secured Equipment Note was repaid in full in August 2018.