XML 49 R37.htm IDEA: XBRL DOCUMENT
v3.25.2

Investments - Schedule of Available for Sale Fixed Maturity Securities Contractual Maturity (Details) - USD ($) | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Net Investment Income [Line Items] |  |
Cost or Amortized Cost | $ 228,986,581 | $ 202,308,158
Estimated Fair Value | 217,679,350 | 186,893,438
Less than one year |  |
Net Investment Income [Line Items] |  |
Cost or Amortized Cost | 13,437,080 | 9,522,262
Estimated Fair Value | 13,373,658 | 9,484,834
One to five years |  |
Net Investment Income [Line Items] |  |
Cost or Amortized Cost | 72,753,263 | 68,052,387
Estimated Fair Value | 71,493,505 | 66,141,372
Five to ten years |  |
Net Investment Income [Line Items] |  |
Cost or Amortized Cost | 35,376,800 | 38,159,446
Estimated Fair Value | 33,053,951 | 34,068,922
More than 10 years |  |
Net Investment Income [Line Items] |  |
Cost or Amortized Cost | 16,718,663 | 21,044,518
Estimated Fair Value | 13,998,214 | 17,970,347
Residential mortgage and other asset backed securities |  |
Net Investment Income [Line Items] |  |
Cost or Amortized Cost | 90,700,775 | 65,529,545
Estimated Fair Value | $ 85,760,022 | $ 59,227,963

X
- Definition Amortized Cost + References No definition available. + Details
Name: | king_AmortizedCost
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Estimated Fair Value 1 + References No definition available. + Details
Name: | king_EstimatedFairValue1
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
Name: | us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=king_LessThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=king_OneToFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=king_FiveToTenYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=king_MoreThan10YearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=king_ResidentialMortgageAndOtherAssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |