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Subsequent Events (Details) (USD $)	0 Months Ended
	May 25, 2011	Feb. 22, 2011	Jul. 18, 2013 Subsequent event Maximum	Jul. 18, 2013 Subsequent event Minimum
Subsequent events
Common stock to be repurchased under tender offer	$ 20,000,000	$ 15,000,000	$ 12,000,000
Offered price per share under tender offer (in dollars per share)			$ 2.35	$ 2.15

X

- Definition

Represents the per share price offered by the entity, at which the shares can be tendered by the entity's shareholders, under the stock repurchase plan.

+ References

No definition available.

+ Details

Name:	isig_StockRepurchaseProgramOfferedPricePerShare
Namespace Prefix:	isig_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of a stock repurchase plan authorized by an entity's Board of Directors.

+ References

No definition available.

+ Details

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

X

- Details

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