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Note 3 - Option Agreement (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 20, 2012
Note 3 - Option Agreement (Details) [Line Items]        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners       5.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Noncontrolling Interest, Ownership Percentage by Parent       96.00%us-gaap_MinorityInterestOwnershipPercentageByParent
Increase in Shares Covered by Option       10.00%ins_IncreaseInSharesCoveredByOption
Open Option Contracts Written, Exercise Price       1,000,000us-gaap_OpenOptionContractsWrittenExercisePrice
Marketing Expense $ 1,408,000us-gaap_MarketingExpense $ 1,632,000us-gaap_MarketingExpense    
Other Liabilities, Noncurrent 230,000us-gaap_OtherLiabilitiesNoncurrent 185,000us-gaap_OtherLiabilitiesNoncurrent    
Option Expense [Member]        
Note 3 - Option Agreement (Details) [Line Items]        
Marketing Expense     18,000us-gaap_MarketingExpense
/ ins_OptionAgreementAxis
= ins_OptionExpenseMember
 
Other Liabilities, Noncurrent $ 18,000us-gaap_OtherLiabilitiesNoncurrent
/ ins_OptionAgreementAxis
= ins_OptionExpenseMember
$ 18,000us-gaap_OtherLiabilitiesNoncurrent
/ ins_OptionAgreementAxis
= ins_OptionExpenseMember