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Property and Casualty Insurance Activity (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Change in unearned premiums [Member] |  |  |  |
Direct | $ (2,484,903) | $ 3,244,999 | $ (1,813,141) | $ 5,577,883
Assumed | 0 | 0 | 0 | 0
Ceded | (8,636,162) | (9,842,677) | (18,583,421) | (15,412,501)
Net | (11,121,065) | (6,597,678) | (20,396,562) | (9,834,618)
Premiums earned [Member] |  |  |  |
Direct | 51,010,420 | 50,891,943 | 101,006,798 | 100,822,273
Assumed | 0 | 0 | 0 | 0
Ceded | (20,706,808) | (21,383,747) | (41,883,284) | (43,059,124)
Net | 30,303,612 | 29,508,196 | 59,123,514 | 57,763,149
Premiums written Member |  |  |  |
Direct | 53,495,323 | 47,646,944 | 102,819,939 | 95,244,390
Assumed | 0 | 0 | 0 | 0
Ceded | (12,070,646) | (11,541,070) | (23,299,863) | (27,646,623)
Net | $ 41,424,677 | $ 36,105,874 | $ 79,520,076 | $ 67,597,767

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- 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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- 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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- 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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- 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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- 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: |
Data Type: | na
Balance Type: |
Period Type: |