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Commitments and Contingencies - Legal proceedings (Details) $ in Thousands	Feb. 23, 2017 USD ($)
Delta
Legal Proceedings
Collection of unbilled receivables	$ 7,750

X

- Definition

Amount representing both collection of unbilled receivables and reversal of provision for loss on unbilled receivables.

+ References

No definition available.

+ Details

Name:	issc_CollectionOfUnbilledReceivablesAndReversalOfImpairment
Namespace Prefix:	issc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_CounterpartyNameAxis=issc_DeltaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: