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v3.25.2

Earnings Per Common Share - Narrative (Details) - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Earnings Per Share [Abstract] |  |  |  |
Options | 0 | 107,201 | 0 | 107,201

X
- Definition Options + References No definition available. + Details
Name: | king_Options
Namespace Prefix: | king_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration