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Reinsurance - Ceding Revenue (Details ) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Reinsurance Disclosures [Abstract] |  |
Provisional ceding commissions earned | $ 18,829,278 | $ 20,397,454
Contingent ceding commissions earned | 8,668 | 656,040
Ceding commission revenue | $ 18,837,946 | $ 21,053,494

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- Definition Ceding Commission Revenue + References No definition available. + Details
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Namespace Prefix: | kins_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contingent Ceding Commissions Earned + References No definition available. + Details
Name: | kins_ContingentCedingCommissionsEarned
Namespace Prefix: | kins_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The expense incurred by an insurance company to persons or entities for generating or placing insurance or investment contracts with the company, usually determined as a percentage of policy or contract premiums. Excludes advances or draws to be applied against commissions earned. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(7)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
Name: | us-gaap_InsuranceCommissions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ReinsuranceDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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