Discontinued Operations (Narrative) (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Discontinued Operations [Abstract]
Discontinued operations, non-cash operating lease assets and lease liabilities	$ 761

Discontinued Operations, Non-Cash Operating Lease Assets And Lease Liabilities

No definition available.

Name:	iin_DiscontinuedOperationsNonCashOperatingLeaseAssetsAndLeaseLiabilities
Namespace Prefix:	iin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant