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Property and Casualty Insurance Activity - Schedule of Earned Premiums (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Change in unearned premiums |  |
Effects of Reinsurance [Line Items] |  |
Direct | $ 385,341 | $ 2,470,381
Assumed | 0 | 0
Ceded | (22,109,764) | (19,956,725)
Net | (21,724,423) | (17,486,344)
Premiums earned |  |
Effects of Reinsurance [Line Items] |  |
Direct | 69,988,722 | 60,645,377
Assumed | 0 | 0
Ceded | (14,119,908) | (17,122,314)
Net | 55,868,814 | 43,523,063
Premiums written |  |
Effects of Reinsurance [Line Items] |  |
Direct | 69,603,381 | 58,174,996
Assumed | 0 | 0
Ceded | 7,989,856 | 2,834,411
Net | $ 77,593,237 | $ 61,009,407

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

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

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

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

X
- 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: |

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

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