XML 67 R51.htm IDEA: XBRL DOCUMENT v3.23.1

Investments (Details 4) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Amortized cost	$ 7,766,140	$ 8,266,334
Estimated fair value	6,600,388	8,753,159
Less Than One Year [Member]
Amortized cost	708,535	994,712
Estimated fair value	743,575	1,008,180
One To Five Years [Member]
Amortized cost	1,120,507	1,205,829
Estimated fair value	1,088,522	1,290,465
Five To Ten Years [Member]
Amortized cost	1,402,704	1,513,942
Estimated fair value	1,200,720	1,648,808
More Than 10 Years [Member]
Amortized cost	4,534,394	4,551,851
Estimated fair value	$ 3,567,571	$ 4,805,706

X

- References

No definition available.

+ Details

Name:	king_AmortizedCostHeldToMaturitySecurities
Namespace Prefix:	king_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	king_FairValueHeldToMaturitySecurities
Namespace Prefix:	king_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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: