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Note 5 - Accounts Receivable and Customer Concentrations (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Receivables [Abstract] |  |
Allowance for Doubtful Accounts Receivable, Current | $ 13,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 16,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Allowance for Loan and Lease Losses, Write-offs | $ 12,000 us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs | $ 4,000 us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Percentage of Consolidated Revenue | 10.00%ins_PercentageofConsolidatedRevenue |

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- Definition The percentage of consolidated revenue during the period. + References No definition available. + Details
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Namespace Prefix: | ins_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + 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 210.9-03.7(d)) -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 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Details
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