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Note 1 - Organization and Summary of Significant Accounting Policies (Details) - Leased Equipment (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Leased Equipment [Abstract] |  |
Cost of leased equipment | $ 514 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassOtherPropertyPlantAndEquipment | $ 473 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassOtherPropertyPlantAndEquipment
Accumulated depreciation | (355)us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassPropertyPlantAndEquipmentOtherAccumulatedDepreciation | (290)us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassPropertyPlantAndEquipmentOtherAccumulatedDepreciation
Carrying value of leased equipment | $ 159 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassOtherPropertyPlantAndEquipmentNet | $ 183 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassOtherPropertyPlantAndEquipmentNet

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- Details
Name: | ins_LeasedEquipmentAbstract
Namespace Prefix: | ins_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Long-lived depreciable assets not included within other defined categories that are subject to a lease meeting the criteria for capitalization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 2) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6394851&loc=SL2265659-115463 + Details
Name: | us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassOtherPropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The net amount of long-lived depreciable assets not included within other defined categories that are subject to a lease meeting the criteria for capitalization. + References No definition available. + Details
Name: | us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassOtherPropertyPlantAndEquipmentNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The cumulative amount of depreciation for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization not included within the other defined categories in the taxonomy. + References No definition available. + Details
Name: | us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassPropertyPlantAndEquipmentOtherAccumulatedDepreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant