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Note 3 - Revenue From Contracts With Customers - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2019
Accounts receivable, balance |  | $ 5,655
Accounts receivable, additions |  | 23,500
Accounts receivable, deductions |  | 24,844
Accounts receivable, balance | $ 4,311 | 4,311
Unbilled services, balance |  | 5,904
Unbilled services, additions |  | 13,708
Unbilled services, deductions |  | 8,938
Unbilled services, balance | 10,674 | 10,674
Balance |  | 2,552
Customer deposits, additions |  | 4,612
Customer deposits, deductions |  | 1,881
Balance | 5,283 | 5,283
Amounts included in the contract liability balance at the beginning of the period | $ 1,378 | $ 1,881

X
- Definition The amount of accounts receivable asset contract with customer. + References No definition available. + Details
Name: | sxi_ContractWithCustomerAssetAccountsReceivable
Namespace Prefix: | sxi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of additions to accounts receivable contract with customer assets. + References No definition available. + Details
Name: | sxi_ContractWithCustomerAssetAccountsReceivableAdditions
Namespace Prefix: | sxi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of deductions of accounts receivable assets contract with customer. + References No definition available. + Details
Name: | sxi_ContractWithCustomerAssetAccountsReceivableDeductions
Namespace Prefix: | sxi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of unbilled services asset contract with customer. + References No definition available. + Details
Name: | sxi_ContractWithCustomerAssetUnbilledServices
Namespace Prefix: | sxi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of additions to unbilled services contract with customer assets. + References No definition available. + Details
Name: | sxi_ContractWithCustomerAssetUnbilledServicesAdditions
Namespace Prefix: | sxi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of deductions of unbilled services asset contract with customer. + References No definition available. + Details
Name: | sxi_ContractWithCustomerAssetUnbilledServicesDeductions
Namespace Prefix: | sxi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of additions to customer deposits liability contract with customer. + References No definition available. + Details
Name: | sxi_ContractWithCustomerLiabilityCustomerDepositsAdditions
Namespace Prefix: | sxi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of deductions of customer deposits liability contract with customer. + References No definition available. + Details
Name: | sxi_ContractWithCustomerLiabilityCustomerDepositsDeductions
Namespace Prefix: | sxi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044 + Details
Name: | us-gaap_ContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration