The amount of anticipated quarterly revenue to be received under the supply agreement.

No definition available.

Name:	stri_AnticipatedQuarterlyRevenueUnderSupplyAgreement
Namespace Prefix:	stri_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045

+ Details

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

- Details

Name:	srt_ProductOrServiceAxis=stri_DeliveryAndInstallationOfEquipmentAndTrainingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 18 - Subsequent Event (Details Textual) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended			6 Months Ended
	Jul. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jul. 29, 2019	Jan. 16, 2018
Revenue, Remaining Performance Obligation, Amount								$ 6,000
Revenue from Contract with Customer, Including Assessed Tax		$ 1,701	$ 2,515	$ 1,750	$ 3,518	$ 6,261
Delivery and Installation of Equipment and Training [Member]
Revenue, Remaining Performance Obligation, Amount								$ 2,000
Subsequent Event [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 2,000
Anticipated Quarterly Revenue Under Supply Agreement							$ 5,000
Subsequent Event [Member] \| Delivery and Installation of Equipment and Training [Member]
Revenue, Remaining Performance Obligation, Amount							$ 3,000