Number of warrants or rights vested during period.

No definition available.

Name:	srtk_ClassOfWarrantOrRightVestedDuringPeriod
Namespace Prefix:	srtk_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the expected proceeds from the transaction, required for the vesting of share-based payments.

+ References

No definition available.

+ Details

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Namespace Prefix:	srtk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents warrant contra revenue.

+ References

No definition available.

+ Details

Name:	srtk_WarrantContraRevenue
Namespace Prefix:	srtk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

+ Details

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Face amount or stated value per share of common stock.

+ 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(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

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

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=srtk_AmazonTransactionAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201908Member
Namespace Prefix:
Data Type:	na
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Period Type:

Note 10 - Share-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended		12 Months Ended
	Feb. 29, 2020	Jan. 01, 2020	May 31, 2019	Jan. 23, 2018	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Common Stock, Par or Stated Value Per Share (in dollars per share)				$ 0.01	$ 0.01		$ 0.01
Warrant Contra Revenue					$ 278	$ (0)
Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Expense					$ 291
Amazon Transaction Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				4,000,000			4,002,964
Class of Warrant or Right, Vested During Period (in shares)	212,953		212,766	425,532
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Expected Proceeds from Transaction Required for Vesting				$ 600,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 9.96			$ 9.95
Warrant Contra Revenue	$ 278		$ 730				$ 565
Amazon Transaction Agreement [Member] \| Accounting Standards Update 2019-08 [Member]
Warrant Contra Revenue		$ (413)