XML 64 R48.htm IDEA: XBRL DOCUMENT
v3.23.1

Investments (Details 1) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized cost | $ 154,715,163 | $ 158,080,110
Estimated fair value | 174,918,427 | 155,808,478
Residential mortgage and other asset backed securities [Member] |  |
Amortized cost | 53,597,264 | 58,036,959
Estimated fair value | 45,622,195 | 57,783,342
Less Than One Year [Member] |  |
Amortized cost | 16,359,100 | 1,153,099
Estimated fair value | 16,307,991 | 1,156,636
One To Five Years [Member] |  |
Amortized cost | 18,605,987 | 43,007,110
Estimated fair value | 14,085,113 | 44,914,759
Five To Ten Years [Member] |  |
Amortized cost | 54,559,158 | 26,808,853
Estimated fair value | 52,230,283 | 27,332,581
More Than 10 Years [Member] |  |
Amortized cost | 31,796,918 | 26,802,457
Estimated fair value | $ 26,469,581 | $ 26,892,792

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

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

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

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: |