Percentage points increase each year added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

Name:	stri_DebtInstrumentBasisSpreadOnVariableRateIncreasePerYear
Namespace Prefix:	stri_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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

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

- Definition

Amount of the required periodic payments applied to principal.

+ 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

+ Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=stri_LoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=stri_FirstTwoYearsLoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_EurodollarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=stri_ThirdAndForthYearLoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=stri_FifthYearLoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 12 - Long-term Debt (Details Textual) $ in Thousands, € in Millions	Mar. 13, 2019 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2019 EUR (€)
Loan Agreement [Member]
Debt Instrument, Face Amount		$ 2,244	€ 2
Debt Instrument, Periodic Payment, Principal	$ 100
First Two Years Loan Agreement [Member] \| Eurodollar [Member]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Third and Forth Year Loan Agreement [Member] \| Eurodollar [Member]
Debt Instrument, Basis Spread on Variable Rate, Increase Per Year	1.00%
Fifth Year Loan Agreement [Member] \| Eurodollar [Member]
Debt Instrument, Basis Spread on Variable Rate	5.00%