XML 53 R40.htm IDEA: XBRL DOCUMENT v3.10.0.1

Unbilled Receivables (Details) - USD ($)	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Feb. 23, 2017
Unbilled Receivables
Unbilled receivables, net of progress payments					$ 1,480,822					$ 1,480,822
Cumulative change in operating income resulting from changes in estimates	$ (444,240)	$ (1,072,228)	$ (1,143,511)	$ (1,051,560)	$ (926,999)	$ (541,189)	$ 2,985,918	$ (1,595,295)	$ (3,711,539)	(77,565)	$ 2,443,187
Long-term contracts accounted for under percentage-of-completion
Unbilled Receivables
Cumulative change in operating income resulting from changes in estimates									0	61,000	$ (58,000)
Delta
Unbilled Receivables
Amount paid												$ 7,750,000
Delta | Selling, general and administrative expenses
Unbilled Receivables
Reversal of reserve									3,600,000
Delta | Other income
Unbilled Receivables
Reminder of amount paid									$ 4,100,000	$ 4,100,000

X

- Definition

Amount paid towards reversal of reserve and collection of the unbilled receivables.

+ References

No definition available.

+ Details

Name:	issc_UnbilledReceivablesAmountPaid
Namespace Prefix:	issc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The remaining amount paid after reversal of reserve.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of reversal of reserves created under unbilled receivables.

+ References

No definition available.

+ Details

Name:	issc_UnbilledReceivablesReversalOfReserve
Namespace Prefix:	issc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_ChangeInAccountingEstimateLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

Name:	us-gaap_OperatingIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	us-gaap_UnbilledReceivablesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_ChangeInAccountingEstimateByTypeAxis=us-gaap_ContractsAccountedForUnderPercentageOfCompletionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_OtherIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: