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Property and Casualty Insurance Activity - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Property and Casualty Insurance Activity |  |
Advance premiums | $ 3,503,063 | $ 3,797,590
Incurred losses under reinsurance contracts | 20,226,354 | 41,091,205
Prior year loss development | $ 1,779,827 | $ 7,273

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- Definition Advance Premiums + References No definition available. + Details
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Namespace Prefix: | kins_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Prior year loss development + References No definition available. + Details
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Namespace Prefix: | kins_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Property and Casualty Insurance Activity + References No definition available. + Details
Name: | kins_PropertyAndCasualtyInsuranceActivityAbstract
Namespace Prefix: | kins_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Excess (deficiency) of net proceeds received over the net carrying value of a certain, bundled grouping of insurance policies. + References No definition available. + Details
Name: | us-gaap_GainLossOnSaleOfInsuranceBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration