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Property and Casualty Insurance Activity - Schedule of Earned Premiums (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Change in unearned premiums |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Direct | $ 1,968,256 | $ (2,484,903) | $ 4,438,637 | $ (1,813,141)
Assumed | 0 | 0 | 0 | 0
Ceded | (7,963,670) | (8,636,162) | (27,920,395) | (18,583,421)
Net | (5,995,414) | (11,121,065) | (23,481,758) | (20,396,562)
Premiums earned |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Direct | 63,030,665 | 51,010,420 | 123,676,042 | 101,006,798
Assumed | 0 | 0 | 0 | 0
Ceded | (16,815,405) | (20,706,808) | (33,937,719) | (41,883,284)
Net | 46,215,260 | 30,303,612 | 89,738,323 | 59,123,514
Premiums written |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Direct | 61,062,409 | 53,495,323 | 119,237,405 | 102,819,939
Assumed | 0 | 0 | 0 | 0
Ceded | (8,851,735) | (12,070,646) | (6,017,324) | (23,299,863)
Net | $ 52,210,674 | $ 41,424,677 | $ 113,220,081 | $ 79,520,076

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- Definition Assumed + References No definition available. + Details
Name: | king_AssumedPropertyAndCasultyInsuranceActivity
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Ceded + References No definition available. + Details
Name: | king_CededPropertyAndCasultyInsuranceActivity
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Direct + References No definition available. + Details
Name: | king_DirectPropertyAndCasultyInsuranceActivity
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Net + References No definition available. + Details
Name: | king_NetPropertyAndCasultyInsuranceActivity
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_EffectsOfReinsuranceLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=king_ChangeInUnearnedPremiumsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=king_PremiumsEarnedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_TitleOfIndividualAxis=king_PremiumsWrittenMember
Namespace Prefix: |
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Balance Type: |
Period Type: |