The percentage of cost method investments sold during the period.

No definition available.

Name:	ins_CostMethodInvestmentsPercentSold
Namespace Prefix:	ins_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from the issuance of restricted cash back to the company from certain holding accounts.

+ References

No definition available.

+ Details

Name:	ins_ProceedsFromIssuanceOfRestrictedCash
Namespace Prefix:	ins_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

+ References

No definition available.

+ Details

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

- Definition

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References

No definition available.

+ Details

Name:	us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

+ Details

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

- Details

Name:	invest_InvestmentAxis=ins_LumenseIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	invest_InvestmentAxis=ins_PrivatelyHeldTechnologyCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 3 - Investments (Details Textual) - USD ($)	3 Months Ended				9 Months Ended
Note 3 - Investments (Details Textual) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Cost-method Investments, Other than Temporary Impairment					$ 255,000	$ 93,000
Proceeds From Issuance of Restricted Cash			$ 372,000
Gain (Loss) on Sale of Investments, Total						1,838,000
Lumense Inc. [Member]
Cost-method Investments, Other than Temporary Impairment	$ 250,000	$ 10,000		$ 90,000
Privately-held Technology Company [Member]
Cost Method Investments, Percent Sold			91.00%
Gain (Loss) on Sale of Investments, Total			$ 1,466,000
Cost Method Investments			$ 98,000			$ 98,000