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Note 10 - Derivative Financial Instruments (Details) - Fair Value of Swaps Recognized in Accrued Liabilities and in Other Comprehensive Income (Loss) (USD $)	6 Months Ended
	Dec. 31, 2014	Jun. 30, 2014
Note 10 - Derivative Financial Instruments (Details) - Fair Value of Swaps Recognized in Accrued Liabilities and in Other Comprehensive Income (Loss) [Line Items]
Fair Value	$ (656,000)us-gaap_DerivativeFairValueOfDerivativeLiability	$ (1,061,000)us-gaap_DerivativeFairValueOfDerivativeLiability
Interest Rate Swap 1 [Member] | Effective Date 1 [Member]
Note 10 - Derivative Financial Instruments (Details) - Fair Value of Swaps Recognized in Accrued Liabilities and in Other Comprehensive Income (Loss) [Line Items]
Notional Amount	5,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap1Member / us-gaap_RangeAxis = sxi_EffectiveDate1Member
Fixed Rate	2.495%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap1Member / us-gaap_RangeAxis = sxi_EffectiveDate1Member
Maturity	May 24, 2015
Fair Value	(49,000)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap1Member / us-gaap_RangeAxis = sxi_EffectiveDate1Member	(108,000)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap1Member / us-gaap_RangeAxis = sxi_EffectiveDate1Member
Interest Rate Swap 2 [Member] | Effective Date 1 [Member]
Note 10 - Derivative Financial Instruments (Details) - Fair Value of Swaps Recognized in Accrued Liabilities and in Other Comprehensive Income (Loss) [Line Items]
Notional Amount	5,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap2Member / us-gaap_RangeAxis = sxi_EffectiveDate1Member
Fixed Rate	2.495%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap2Member / us-gaap_RangeAxis = sxi_EffectiveDate1Member
Maturity	May 24, 2015
Fair Value	(49,000)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap2Member / us-gaap_RangeAxis = sxi_EffectiveDate1Member	(108,000)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap2Member / us-gaap_RangeAxis = sxi_EffectiveDate1Member
Interest Rate Swap 3 [Member] | Effective Date 2 [Member]
Note 10 - Derivative Financial Instruments (Details) - Fair Value of Swaps Recognized in Accrued Liabilities and in Other Comprehensive Income (Loss) [Line Items]
Notional Amount	10,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap3Member / us-gaap_RangeAxis = sxi_EffectiveDate2Member
Fixed Rate	2.395%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap3Member / us-gaap_RangeAxis = sxi_EffectiveDate2Member
Maturity	May 26, 2015
Fair Value	(94,000)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap3Member / us-gaap_RangeAxis = sxi_EffectiveDate2Member	(206,000)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap3Member / us-gaap_RangeAxis = sxi_EffectiveDate2Member
Interest Rate Swap 4 [Member] | Effective Date 3 [Member]
Note 10 - Derivative Financial Instruments (Details) - Fair Value of Swaps Recognized in Accrued Liabilities and in Other Comprehensive Income (Loss) [Line Items]
Notional Amount	5,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap4Member / us-gaap_RangeAxis = sxi_EffectiveDate3Member
Fixed Rate	2.34%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap4Member / us-gaap_RangeAxis = sxi_EffectiveDate3Member
Maturity	May 26, 2015
Fair Value	(46,000)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap4Member / us-gaap_RangeAxis = sxi_EffectiveDate3Member	(100,000)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap4Member / us-gaap_RangeAxis = sxi_EffectiveDate3Member
Interest Rate Swap 5 [Member] | Effective Date 4 [Member]
Note 10 - Derivative Financial Instruments (Details) - Fair Value of Swaps Recognized in Accrued Liabilities and in Other Comprehensive Income (Loss) [Line Items]
Notional Amount	5,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap5Member / us-gaap_RangeAxis = sxi_EffectiveDate4Member
Fixed Rate	2.38%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap5Member / us-gaap_RangeAxis = sxi_EffectiveDate4Member
Maturity	May 24, 2015
Fair Value	(47,000)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap5Member / us-gaap_RangeAxis = sxi_EffectiveDate4Member	(103,000)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap5Member / us-gaap_RangeAxis = sxi_EffectiveDate4Member
Interest Rate Swap 6 [Member] | Effective Date 5 [Member]
Note 10 - Derivative Financial Instruments (Details) - Fair Value of Swaps Recognized in Accrued Liabilities and in Other Comprehensive Income (Loss) [Line Items]
Notional Amount	5,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap6Member / us-gaap_RangeAxis = sxi_EffectiveDate5Member
Fixed Rate	1.595%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap6Member / us-gaap_RangeAxis = sxi_EffectiveDate5Member
Maturity	Sep. 22, 2014
Fair Value		(18,000)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap6Member / us-gaap_RangeAxis = sxi_EffectiveDate5Member
Interest Rate Swap 7 [Member] | Effective Date 6 [Member]
Note 10 - Derivative Financial Instruments (Details) - Fair Value of Swaps Recognized in Accrued Liabilities and in Other Comprehensive Income (Loss) [Line Items]
Notional Amount	10,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap7Member / us-gaap_RangeAxis = sxi_EffectiveDate6Member
Fixed Rate	2.745%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap7Member / us-gaap_RangeAxis = sxi_EffectiveDate6Member
Maturity	Mar. 15, 2016
Fair Value	(295,000)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap7Member / us-gaap_RangeAxis = sxi_EffectiveDate6Member	(418,000)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap7Member / us-gaap_RangeAxis = sxi_EffectiveDate6Member
Interest Rate Swap 8 [Member] | Effective Date 7 [Member]
Note 10 - Derivative Financial Instruments (Details) - Fair Value of Swaps Recognized in Accrued Liabilities and in Other Comprehensive Income (Loss) [Line Items]
Notional Amount	20,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap8Member / us-gaap_RangeAxis = sxi_EffectiveDate7Member
Fixed Rate	1.18%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap8Member / us-gaap_RangeAxis = sxi_EffectiveDate7Member
Maturity	Dec. 19, 2017
Fair Value	(31,000)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap8Member / us-gaap_RangeAxis = sxi_EffectiveDate7Member
Interest Rate Swap 9 [Member] | Effective Date 7 [Member]
Note 10 - Derivative Financial Instruments (Details) - Fair Value of Swaps Recognized in Accrued Liabilities and in Other Comprehensive Income (Loss) [Line Items]
Notional Amount	5,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap9Member / us-gaap_RangeAxis = sxi_EffectiveDate7Member
Fixed Rate	1.20%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap9Member / us-gaap_RangeAxis = sxi_EffectiveDate7Member
Maturity	Dec. 19, 2017
Fair Value	(11,000)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap9Member / us-gaap_RangeAxis = sxi_EffectiveDate7Member
Interest Rate Swap 10 [Member] | Effective Date 8 [Member]
Note 10 - Derivative Financial Instruments (Details) - Fair Value of Swaps Recognized in Accrued Liabilities and in Other Comprehensive Income (Loss) [Line Items]
Notional Amount	10,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap10Member / us-gaap_RangeAxis = sxi_EffectiveDate8Member
Fixed Rate	2.005%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap10Member / us-gaap_RangeAxis = sxi_EffectiveDate8Member
Maturity	Dec. 19, 2019
Fair Value	$ (34,000)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = sxi_InterestRateSwap10Member / us-gaap_RangeAxis = sxi_EffectiveDate8Member

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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- Details

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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313

+ Details

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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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X

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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