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Note 11 - Related Party Transaction (Details Textual) - ISC Properties LLC [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Chief Executive Officer [Member] |  |
Related Party Ownership Percentage | 100.00% |
Related Party Transaction, Expenses from Transactions with Related Party | $ 275,000 | $ 468,000

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- Definition Related party ownership percentage. + References No definition available. + Details
Name: | ins_RelatedPartyOwnershipPercentage
Namespace Prefix: | ins_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ins_IscPropertiesLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TitleOfIndividualAxis=us-gaap_ChiefExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |