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Income Taxes - Schedule of Differences Reclassified for Tax Purposes (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Income Tax Disclosure [Abstract] |  |
(Decrease) increase in capital in excess of par value | $ (381,550) | $ 4,336,903
Increase (decrease) in total distributable earnings | $ 381,550 | $ (4,336,903)

X
- Definition Change in distributable earnings. + References No definition available. + Details
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Namespace Prefix: | rand_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Change in paid in capital in excess of par value. + References No definition available. + Details
Name: | rand_ChangeInPaidInCapitalInExcessOfParValue
Namespace Prefix: | rand_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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