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Note 1 - Organization and Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended | 141 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014
Note 1 - Organization and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Number of Operating Segments | 2 us-gaap_NumberOfOperatingSegments |  |
Marketable Securities | $ 463,000 us-gaap_MarketableSecurities |  | $ 463,000 us-gaap_MarketableSecurities
Marketable Securities, Unrealized Gain (Loss) | 20,000 us-gaap_MarketableSecuritiesUnrealizedGainLoss |  |
Inventory Valuation Reserves | 95,000 us-gaap_InventoryValuationReserves | 102,000 us-gaap_InventoryValuationReserves | 95,000 us-gaap_InventoryValuationReserves
Operating Leases, Income Statement, Lease Revenue | 617,000 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue | 1,566,000 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue |
Operating Leases, Future Minimum Payments Receivable | 425,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable | 125,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable | 425,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments | 145,000 us-gaap_CostmethodInvestmentsRealizedGainLossExcludingOtherThanTemporaryImpairments |  |
Cost-method Investments, Other than Temporary Impairment | 17,000 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment |  |
Gain on Sale of Investments | 128,000 us-gaap_GainOnSaleOfInvestments | 1,000 us-gaap_GainOnSaleOfInvestments |
Equity Method Investments | 913,000 us-gaap_EquityMethodInvestments | 914,000 us-gaap_EquityMethodInvestments | 913,000 us-gaap_EquityMethodInvestments
Cost Method Investments | 692,000 us-gaap_CostMethodInvestments | 736,000 us-gaap_CostMethodInvestments | 692,000 us-gaap_CostMethodInvestments
Finite-Lived Intangible Asset, Useful Life | 10 years |  |
Product Warranty Accrual | 122,000 us-gaap_ProductWarrantyAccrual | 141,000 us-gaap_ProductWarrantyAccrual | 122,000 us-gaap_ProductWarrantyAccrual
Allocated Share-based Compensation Expense | 49,000 us-gaap_AllocatedShareBasedCompensationExpense | 82,000 us-gaap_AllocatedShareBasedCompensationExpense |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) | 16,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross | 17,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross | 1,231,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | 17,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  | 17,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
General and Administrative Expense [Member] |  |  |
Note 1 - Organization and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Depreciation | 353,000 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | 386,000 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember |
Patents [Member] |  |  |
Note 1 - Organization and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Amortization of Intangible Assets | 45,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |  |
Previously Written Off [Member] |  |  |
Note 1 - Organization and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Gain on Sale of Investments |  | $ 1,000 us-gaap_GainOnSaleOfInvestments / invest_InvestmentAxis = ins_PreviouslyWrittenOffMember |
The 2011 Non-employee Directors Stock Option Plan [Member] |  |  |
Note 1 - Organization and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) | 16,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = ins_The2011NonEmployeeDirectorsStockOptionPlanMember | 17,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = ins_The2011NonEmployeeDirectorsStockOptionPlanMember |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) | $ 1.06 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = ins_The2011NonEmployeeDirectorsStockOptionPlanMember | $ 1.05 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = ins_The2011NonEmployeeDirectorsStockOptionPlanMember |

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- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 + Details
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- Definition This item represents the gain (loss) realized during the period from the sale of investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph c -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 + Details
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- Definition The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale. + References No definition available. + Details
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- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707 + Details
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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(5)) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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