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ROYALTY ADVANCES (Details) - USD ($) | 9 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
ROYALTY ADVANCES |  |
Balance at beginning of period | $ 70,690,618 | $ 69,775,565
Additions | 10,703,682 | 13,957,135
Recoupments | (12,210,448) | (17,065,801)
Foreign currency translation | 289,012 | (74,363)
Balance at end of period | $ 69,472,864 | $ 66,592,536

X
- Definition The amount of advance royalties additions. + References No definition available. + Details
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Namespace Prefix: | rsvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of change in advance royalties from foreign currency translation. + References No definition available. + Details
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Namespace Prefix: | rsvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of advance royalties recoupments. + References No definition available. + Details
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Namespace Prefix: | rsvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition The amount paid to music publishers, record producers, songwriters, or other artists in advance of their earning royalties from record or music sales. Such an amount is based on contractual terms and is generally nonrefundable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 928 -SubTopic 340 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477426/928-340-45-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration