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Note 13 - Stock Option Plans (Details) (USD $)
12 Months Ended 141 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Aug. 31, 2000
Note 13 - Stock Option Plans (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 2 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 16,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 17,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 1,231,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     724,320us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period 12,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod 92,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod 232,680us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 250,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber 194,167us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber 250,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 24,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber   24,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 10 years 10 years    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars) $ 17,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized   $ 17,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 6 months      
Director [Member] | The Directors Plan [Member]        
Note 13 - Stock Option Plans (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       5,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= ins_TheDirectorsPlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
The 2003 Plan [Member]        
Note 13 - Stock Option Plans (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   450,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= ins_The2003PlanMember
   
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Options Ungranted   80,000ins_SharebasedCompensationArrangementBySharebasedPaymentAwardNumberOfOptionsUngranted
/ us-gaap_PlanNameAxis
= ins_The2003PlanMember
   
The Directors Plan [Member]        
Note 13 - Stock Option Plans (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= ins_TheDirectorsPlanMember
Share-based Compensation Arrangement by Share-based Payment Award, Number of Options Ungranted       48,000ins_SharebasedCompensationArrangementBySharebasedPaymentAwardNumberOfOptionsUngranted
/ us-gaap_PlanNameAxis
= ins_TheDirectorsPlanMember
Number of Options Each Director Received at Each Annual Meeting       4,000ins_NumberOfOptionsEachDirectorReceivedAtEachAnnualMeeting
/ us-gaap_PlanNameAxis
= ins_TheDirectorsPlanMember
Options Vesting Percentage on First and Second Anniversary       50.00%ins_OptionsVestingPercentageOnFirstAndSecondAnniversary
/ us-gaap_PlanNameAxis
= ins_TheDirectorsPlanMember