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CONSOLIDATED SCHEDULE OF INVESTMENTS (Foreign currency forward contracts)
£ in Thousands, $ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2022
AUD ($)
Dec. 31, 2021
AUD ($)
Dec. 31, 2021
GBP (£)
Open Forward Foreign Currency Contract [Line Items]          
Unrealized Gain (Loss) on Derivatives $ 1,507 $ 781      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 1/17/2024          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount $ 115 $ 115      
Derivative Liability, Notional Amount     $ 150 $ 150  
Derivative Asset, Counterparty Name [Extensible Enumeration] mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date Jan. 17, 2024 Jan. 17, 2024      
Unrealized Gain (Loss) on Derivatives $ 13 $ 6      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 1/18/2023          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount $ 118 $ 118      
Derivative Liability, Notional Amount     $ 153 $ 153  
Derivative Asset, Counterparty Name [Extensible Enumeration] mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date Jan. 18, 2023 Jan. 18, 2023      
Unrealized Gain (Loss) on Derivatives $ 14 $ 7      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 1/19/2022          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount   $ 121      
Derivative Liability, Notional Amount       $ 156  
Derivative Asset, Counterparty Name [Extensible Enumeration]   mrcc:BannockburnGlobalForexLlcMember   mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date   Jan. 19, 2022      
Unrealized Gain (Loss) on Derivatives   $ 8      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 1/3/2022          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount   $ 101      
Derivative Liability, Notional Amount | £         £ 82
Derivative Asset, Counterparty Name [Extensible Enumeration]   mrcc:BannockburnGlobalForexLlcMember   mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date   Jan. 03, 2022      
Unrealized Gain (Loss) on Derivatives   $ (10)      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 10/18/2023          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount $ 114 $ 114      
Derivative Liability, Notional Amount     $ 148 $ 148  
Derivative Asset, Counterparty Name [Extensible Enumeration] mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date Oct. 18, 2023 Oct. 18, 2023      
Unrealized Gain (Loss) on Derivatives $ 13 $ 6      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 10/19/2022          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount   $ 117      
Derivative Liability, Notional Amount       $ 152  
Derivative Asset, Counterparty Name [Extensible Enumeration]   mrcc:BannockburnGlobalForexLlcMember   mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date   Oct. 19, 2022      
Unrealized Gain (Loss) on Derivatives   $ 7      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 11/16/2022          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount   $ 105      
Derivative Liability, Notional Amount       $ 136  
Derivative Asset, Counterparty Name [Extensible Enumeration]   mrcc:BannockburnGlobalForexLlcMember   mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date   Nov. 16, 2022      
Unrealized Gain (Loss) on Derivatives   $ 6      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 11/16/2023          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount $ 107 $ 107      
Derivative Liability, Notional Amount     $ 140 $ 140  
Derivative Asset, Counterparty Name [Extensible Enumeration] mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date Nov. 16, 2023 Nov. 16, 2023      
Unrealized Gain (Loss) on Derivatives $ 12 $ 6      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 12/16/2022          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount   $ 109      
Derivative Liability, Notional Amount       $ 142  
Derivative Asset, Counterparty Name [Extensible Enumeration]   mrcc:BannockburnGlobalForexLlcMember   mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date   Dec. 16, 2022      
Unrealized Gain (Loss) on Derivatives   $ 7      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 12/18/2023          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount $ 109 $ 109      
Derivative Liability, Notional Amount     $ 142 $ 142  
Derivative Asset, Counterparty Name [Extensible Enumeration] mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date Dec. 18, 2023 Dec. 18, 2023      
Unrealized Gain (Loss) on Derivatives $ 12 $ 6      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 2/16/2022          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount   $ 105      
Derivative Liability, Notional Amount       $ 136  
Derivative Asset, Counterparty Name [Extensible Enumeration]   mrcc:BannockburnGlobalForexLlcMember   mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date   Feb. 16, 2022      
Unrealized Gain (Loss) on Derivatives   $ 7      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 2/16/2023          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount $ 108 $ 108      
Derivative Liability, Notional Amount     $ 140 $ 140  
Derivative Asset, Counterparty Name [Extensible Enumeration] mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date Feb. 16, 2023 Feb. 16, 2023      
Unrealized Gain (Loss) on Derivatives $ 13 $ 6      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 2/16/2024          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount $ 110 $ 110      
Derivative Liability, Notional Amount     $ 143 $ 143  
Derivative Asset, Counterparty Name [Extensible Enumeration] mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date Feb. 16, 2024 Feb. 16, 2024      
Unrealized Gain (Loss) on Derivatives $ 12 $ 6      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 3/16/2022          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount   $ 102      
Derivative Liability, Notional Amount       $ 132  
Derivative Asset, Counterparty Name [Extensible Enumeration]   mrcc:BannockburnGlobalForexLlcMember   mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date   Mar. 16, 2022      
Unrealized Gain (Loss) on Derivatives   $ 6      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 3/16/2023          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount $ 102 $ 102      
Derivative Liability, Notional Amount     $ 132 $ 132  
Derivative Asset, Counterparty Name [Extensible Enumeration] mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date Mar. 16, 2023 Mar. 16, 2023      
Unrealized Gain (Loss) on Derivatives $ 12 $ 6      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 3/18/2024          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount $ 11,827 $ 11,827      
Derivative Liability, Notional Amount     $ 15,410 $ 15,410  
Derivative Asset, Counterparty Name [Extensible Enumeration] mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date Mar. 18, 2024 Mar. 18, 2024      
Unrealized Gain (Loss) on Derivatives $ 1,329 $ 635      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 4/19/2022          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount   $ 113      
Derivative Liability, Notional Amount       $ 146  
Derivative Asset, Counterparty Name [Extensible Enumeration]   mrcc:BannockburnGlobalForexLlcMember   mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date   Apr. 19, 2022      
Unrealized Gain (Loss) on Derivatives   $ 7      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 4/20/2023          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount $ 123 $ 123      
Derivative Liability, Notional Amount     $ 160 $ 160  
Derivative Asset, Counterparty Name [Extensible Enumeration] mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date Apr. 20, 2023 Apr. 20, 2023      
Unrealized Gain (Loss) on Derivatives $ 14 $ 7      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 4/4/2022          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount   $ 97      
Derivative Liability, Notional Amount | £         £ 79
Derivative Asset, Counterparty Name [Extensible Enumeration]   mrcc:BannockburnGlobalForexLlcMember   mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date   Apr. 04, 2022      
Unrealized Gain (Loss) on Derivatives   $ (10)      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 5/16/2023          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount $ 93 $ 93      
Derivative Liability, Notional Amount     $ 121 $ 121  
Derivative Asset, Counterparty Name [Extensible Enumeration] mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date May 16, 2023 May 16, 2023      
Unrealized Gain (Loss) on Derivatives $ 11 $ 5      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 5/17/2022          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount   $ 107      
Derivative Liability, Notional Amount       $ 138  
Derivative Asset, Counterparty Name [Extensible Enumeration]   mrcc:BannockburnGlobalForexLlcMember   mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date   May 17, 2022      
Unrealized Gain (Loss) on Derivatives   $ 7      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 5/6/2022          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount   $ 36      
Derivative Liability, Notional Amount | £         £ 29
Derivative Asset, Counterparty Name [Extensible Enumeration]   mrcc:BannockburnGlobalForexLlcMember   mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date   May 06, 2022      
Unrealized Gain (Loss) on Derivatives   $ (3)      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 6/17/2022          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount   $ 119      
Derivative Liability, Notional Amount       $ 153  
Derivative Asset, Counterparty Name [Extensible Enumeration]   mrcc:BannockburnGlobalForexLlcMember   mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date   Jun. 17, 2022      
Unrealized Gain (Loss) on Derivatives   $ 7      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 6/19/2023          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount $ 121 $ 121      
Derivative Liability, Notional Amount     $ 156 $ 156  
Derivative Asset, Counterparty Name [Extensible Enumeration] mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date Jun. 19, 2023 Jun. 19, 2023      
Unrealized Gain (Loss) on Derivatives $ 14 $ 7      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 7/18/2022          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount   $ 107      
Derivative Liability, Notional Amount       $ 138  
Derivative Asset, Counterparty Name [Extensible Enumeration]   mrcc:BannockburnGlobalForexLlcMember   mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date   Jul. 18, 2022      
Unrealized Gain (Loss) on Derivatives   $ 7      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 7/18/2023          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount $ 107 $ 107      
Derivative Liability, Notional Amount     $ 138 $ 138  
Derivative Asset, Counterparty Name [Extensible Enumeration] mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date Jul. 18, 2023 Jul. 18, 2023      
Unrealized Gain (Loss) on Derivatives $ 12 $ 6      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 8/16/2022          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount   $ 108      
Derivative Liability, Notional Amount       $ 140  
Derivative Asset, Counterparty Name [Extensible Enumeration]   mrcc:BannockburnGlobalForexLlcMember   mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date   Aug. 16, 2022      
Unrealized Gain (Loss) on Derivatives   $ 7      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 8/16/2023          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount $ 113 $ 113      
Derivative Liability, Notional Amount     $ 146 $ 146  
Derivative Asset, Counterparty Name [Extensible Enumeration] mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date Aug. 16, 2023 Aug. 16, 2023      
Unrealized Gain (Loss) on Derivatives $ 13 $ 6      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 9/16/2022          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount   $ 118      
Derivative Liability, Notional Amount       $ 153  
Derivative Asset, Counterparty Name [Extensible Enumeration]   mrcc:BannockburnGlobalForexLlcMember   mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date   Sep. 16, 2022      
Unrealized Gain (Loss) on Derivatives   $ 7      
Open Forward Foreign Currency Contract, Identifier [Axis]: Foreign currency forward contract with settlement date 9/18/2023          
Open Forward Foreign Currency Contract [Line Items]          
Derivative Asset, Notional Amount $ 113 $ 113      
Derivative Liability, Notional Amount     $ 146 $ 146  
Derivative Asset, Counterparty Name [Extensible Enumeration] mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember mrcc:BannockburnGlobalForexLlcMember
Derivative, Maturity Date Sep. 18, 2023 Sep. 18, 2023      
Unrealized Gain (Loss) on Derivatives $ 13 $ 6