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Note 2 - Acquisition (Details) (USD $) | 0 Months Ended | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Sep. 04, 2014 | Jun. 20, 2014 | Dec. 31, 2014 | Jun. 30, 2014
Note 2 - Acquisition (Details) [Line Items] |  |  |  |
Goodwill |  |  | $ 154,764,000 us-gaap_Goodwill | $ 125,965,000 us-gaap_Goodwill
Trademarks [Member] | MPE Aeroengines Inc. [Member] |  |  |  |
Note 2 - Acquisition (Details) [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets | 1,500,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = sxi_MPEAeroenginesIncMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |  |
Trademarks [Member] | Ultrafryer Systems, Inc. [Member] |  |  |  |
Note 2 - Acquisition (Details) [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets |  | 2,400,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = sxi_UltrafryerSystemsIncMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |
Customer Relationships [Member] | MPE Aeroengines Inc. [Member] |  |  |  |
Note 2 - Acquisition (Details) [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 9,100,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = sxi_MPEAeroenginesIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 15 years |  |  |
Customer Relationships [Member] | Ultrafryer Systems, Inc. [Member] |  |  |  |
Note 2 - Acquisition (Details) [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 4,900,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = sxi_UltrafryerSystemsIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 15 years |  |
Other Intangible Assets [Member] | Ultrafryer Systems, Inc. [Member] | Minimum [Member] |  |  |  |
Note 2 - Acquisition (Details) [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 3 years |  |
Other Intangible Assets [Member] | Ultrafryer Systems, Inc. [Member] | Maximum [Member] |  |  |  |
Note 2 - Acquisition (Details) [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 5 years |  |
Other Intangible Assets [Member] | Ultrafryer Systems, Inc. [Member] |  |  |  |
Note 2 - Acquisition (Details) [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 300,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = sxi_UltrafryerSystemsIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  |
MPE Aeroengines Inc. [Member] |  |  |  |
Note 2 - Acquisition (Details) [Line Items] |  |  |  |
Payments to Acquire Businesses, Gross | 55,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = sxi_MPEAeroenginesIncMember |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = sxi_MPEAeroenginesIncMember |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 10,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = sxi_MPEAeroenginesIncMember |  |  |
Goodwill | 32,800,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = sxi_MPEAeroenginesIncMember |  |  |
Ultrafryer Systems, Inc. [Member] |  |  |  |
Note 2 - Acquisition (Details) [Line Items] |  |  |  |
Payments to Acquire Businesses, Gross |  | 23,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = sxi_UltrafryerSystemsIncMember | 22,986,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = sxi_UltrafryerSystemsIncMember |
Business Acquisition, Percentage of Voting Interests Acquired |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = sxi_UltrafryerSystemsIncMember |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | 7,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = sxi_UltrafryerSystemsIncMember | 7,612,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = sxi_UltrafryerSystemsIncMember |
Goodwill |  | $ 11,000,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = sxi_UltrafryerSystemsIncMember | $ 11,021,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = sxi_UltrafryerSystemsIncMember |

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