XML 46 R33.htm IDEA: XBRL DOCUMENT
v3.24.3

Investments - Schedule of available for sale securities (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Net Investment Income [Line Items] |  |
Cost or Amortized Cost | $ 176,904,251 | $ 164,460,942
Debt instrument, collateral amount | 5,731,000 | 6,999,000
Investments, fair value disclosure | 10,944,000 | 11,412,000
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Net Investment Income [Line Items] |  |
Cost or Amortized Cost | 5,999,188 | 20,954,764
Gross Unrealized Gains | 0 | 1,799
Gross unrealized losses - less than 12 months | 0 | (17,373)
Gross unrealized loss - more than 12 months | (2,128) | 0
Estimated Fair Value | 5,997,060 | 20,939,190
Net Unrealized Losses | (2,128) | (15,574)
Political subdivisions of States, Territories and Possessions |  |
Net Investment Income [Line Items] |  |
Cost or Amortized Cost | 16,499,862 | 16,607,713
Gross Unrealized Gains | 0 | 0
Gross unrealized losses - less than 12 months | 0 | 0
Gross unrealized loss - more than 12 months | (2,610,572) | (3,209,161)
Estimated Fair Value | 13,889,290 | 13,398,552
Net Unrealized Losses | (2,610,572) | (3,209,161)
Corporate and other bonds industrial and miscellaneous |  |
Net Investment Income [Line Items] |  |
Cost or Amortized Cost | 107,655,225 | 75,993,042
Gross Unrealized Gains | 31,957 | 0
Gross unrealized losses - less than 12 months | (49,276) | 0
Gross unrealized loss - more than 12 months | (3,854,059) | (5,885,296)
Estimated Fair Value | 103,783,847 | 70,107,746
Net Unrealized Losses | (3,871,378) | (5,885,296)
Residential mortgage and other asset backed securities |  |
Net Investment Income [Line Items] |  |
Cost or Amortized Cost | 46,749,976 | 50,905,423
Gross Unrealized Gains | 135,681 | 113,761
Gross unrealized losses - less than 12 months | (136) | (2,144)
Gross unrealized loss - more than 12 months | (5,097,373) | (6,541,731)
Estimated Fair Value | 41,788,148 | 44,475,309
Net Unrealized Losses | (4,961,828) | (6,430,114)
Total fixed-maturity securities |  |
Net Investment Income [Line Items] |  |
Cost or Amortized Cost | 176,904,251 | 164,460,942
Gross Unrealized Gains | 167,638 | 115,560
Gross unrealized losses - less than 12 months | (49,412) | (19,517)
Gross unrealized loss - more than 12 months | (11,564,132) | (15,636,188)
Estimated Fair Value | 165,458,345 | 148,920,797
Net Unrealized Losses | (11,445,906) | (15,540,145)
US Treasury Securities |  |
Net Investment Income [Line Items] |  |
Debt instrument, collateral amount | $ 5,997,000 | $ 11,960,000

X
- Definition Gross unrealized loss - more than 12 months + References No definition available. + Details
Name: | king_AvailableForSaleSecuritiesContinuousGrossUnrealizedLossPosition12MonthsOrLongerLosses
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Gross unrealized losses - less than 12 months + References No definition available. + Details
Name: | king_AvailableForSaleSecuritiesContinuousGrossUnrealizedLossPositionLessThan12MonthsLosses
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Estimated fair value + References No definition available. + Details
Name: | king_AvailableForSaleSecuritiesFairValueDisclosure1
Namespace Prefix: | king_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unrealized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of assets pledged to secure a debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477734/942-470-50-3 + Details
Name: | us-gaap_DebtInstrumentCollateralAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_InvestmentsFairValueDisclosure
Namespace Prefix: | us-gaap_
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_USTreasurySecuritiesAndObligationsUSGovernmentCorporationsAndAgenciesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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