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Note 10 - Derivative Financial Instruments (Details) (USD $)
Dec. 31, 2014
Jun. 30, 2014
Interest Rate Swap [Member]    
Note 10 - Derivative Financial Instruments (Details) [Line Items]    
Derivative, Notional Amount $ 75,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		  
Derivative, Average Fixed Interest Rate 1.99%us-gaap_DerivativeAverageFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		  
Foreign Exchange Contract [Member]    
Note 10 - Derivative Financial Instruments (Details) [Line Items]    
Outstanding forward contracts, unrealized gain loss $ (100,000)sxi_OutstandingForwardContractsNetUnrealizedGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 $ (1,200,000)sxi_OutstandingForwardContractsNetUnrealizedGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember