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Property and Casualty Insurance Activity - Schedule of Earned Premiums (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Change in unearned premiums |  |
Effects of Reinsurance [Line Items] |  |
Direct | $ 2,470,381 | $ 671,762
Assumed | 0 | 0
Ceded | (19,956,725) | (9,947,259)
Net | (17,486,344) | (9,275,497)
Premiums earned |  |
Effects of Reinsurance [Line Items] |  |
Direct | 60,645,377 | 49,996,378
Assumed | 0 | 0
Ceded | (17,122,314) | (21,176,476)
Net | 43,523,063 | 28,819,902
Premiums written |  |
Effects of Reinsurance [Line Items] |  |
Direct | 58,174,996 | 49,324,616
Assumed | 0 | 0
Ceded | 2,834,411 | (11,229,217)
Net | $ 61,009,407 | $ 38,095,399

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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

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: |