XML 20 R10.htm IDEA: XBRL DOCUMENT
v3.25.0.1

FINANCIAL HIGHLIGHTS SCHEDULE - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |
Net asset value, beginning of year | [1] | $ 23.56 | $ 22.36 | $ 23.54 | $ 17.86 | $ 32.93
Net investment income (loss) | [1] | 1.33 | 1.15 | 1.72 | (1.01) | 0.68
Net increase (decrease) in net assets from operations | [1] | 3.42 | 2.53 | (0.34) | 6.12 | 0.29
Purchase of treasury shares | [1] | 0 | 0 | 0 | 0 | (0.03)
Effect of the stock dividend | [1] | 0 | 0 | 0 | 0 | (12.16)
Declaration of cash dividend | [1] | (1.67) | (1.33) | (0.83) | (0.44) | (3.17)
Increase (decrease) in net assets | [1] | 1.75 | 1.2 | (1.18) | 5.68 | (15.07)
Net asset value, end of year | [1] | 25.31 | 23.56 | 22.36 | 23.54 | 17.86
Per share market value, end of year | [1] | $ 19.25 | $ 12.99 | $ 13.32 | $ 16.99 | $ 17.6
Total return based on market value | [2] | 88.58% | 7.26% | (16.99%) | 6.51% | (22.64%)
Total return based on net asset value | [3] | 28.78% | 11.31% | (1.45%) | 34.28% | (40.87%)
Supplemental data: |  |  |  |  |  |
Net assets, end of period |  | $ 65,332,520 | $ 60,815,213 | $ 57,721,320 | $ 60,745,416 | $ 46,104,830
Ratio of expenses before income taxes to average net assets |  | 7.67% | 7.05% | 1.89% | 12.49% | 3.96%
Ratio of expenses including taxes to average net assets |  | 7.60% | 10.88% | 2.25% | 12.11% | 6.62%
Ratio of net investment income (loss) to average net assets |  | 5.43% | 5.01% | 7.48% | (4.88%) | 3.52%
Portfolio turnover |  | 18.90% | 29.40% | 11.20% | 37.80% | 29.40%
Total amount of senior securities outstanding, exclusive of treasury securities |  | $ 600,000 | $ 16,250,000 | $ 2,550,000 |  |
Asset coverage per unit | [4] | 10988.80% | 474.20% | 2363.60% |  |
Net Realized Gains (Losses) |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |
Net realized gain (losses) and Net change in unrealized appreciation (depreciation) | [1] | $ 4.31 | $ 0.27 | $ 0.27 | $ 2.26 | $ (2.32)
Net Change in Unrealized (Depreciation) Appreciation |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |
Net realized gain (losses) and Net change in unrealized appreciation (depreciation) | [1] | $ (2.22) | $ 1.11 | $ (2.33) | $ 4.87 | $ 1.93
[1] | Per share data are based on shares outstanding and results are rounded.
[2] | Total return based on market value is calculated as the change in market value per share during the period plus declared dividends per share, assuming reinvestment of dividends, divided by the beginning market value per share
[3] | Total return based on net asset value is calculated as the change in net asset value per share during the period plus declared dividends per share, divided by the beginning net asset value per share.
[4] | Asset coverage per unit is the ratio of the carrying value of the Corporation's total consolidated assets, less liabilities and indebtedness not represented by senior securities, to the aggregate amount of senior securities representing indebtedness.

X
- Definition Asset coverage per unit. + References No definition available. + Details
Name: | rand_AssetCoveragePerUnit
Namespace Prefix: | rand_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Investment company effect of the stock dividend. + References No definition available. + Details
Name: | rand_InvestmentCompanyEffectOfTheStockDividend
Namespace Prefix: | rand_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Ratio of expenses before income taxes to average net assets. + References No definition available. + Details
Name: | rand_RatioOfExpensesBeforeIncomeTaxesToAverageNetAssets
Namespace Prefix: | rand_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Ratio of expenses including income taxes to average net assets. + References No definition available. + Details
Name: | rand_RatioOfExpensesIncludingIncomeTaxesToAverageNetAssets
Namespace Prefix: | rand_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of net assets (liabilities). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 30 -Topic 205 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479910/205-30-50-1 + Details
Name: | us-gaap_AssetsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Per share or unit amount of distribution to shareholders. Includes, but is not limited to, dividend and capital gain. Excludes distribution for tax return of capital. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480990/946-20-50-8 + Details
Name: | us-gaap_InvestmentCompanyDistributionToShareholdersPerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-7 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-7 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-7 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-7 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-7 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-7 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 27 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-27 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-2 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-3 + Details
Name: | us-gaap_InvestmentCompanyFinancialHighlightsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Per share or unit amount of realized and unrealized gain (loss) on investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-7 + Details
Name: | us-gaap_InvestmentCompanyGainLossOnInvestmentPerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share or unit amount of investment income (loss) and realized and unrealized gain (loss) on investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-7 + Details
Name: | us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share or unit amount, after investment expense, of dividend and interest investment income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-7 + Details
Name: | us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of investment income (loss) to average net assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-10 + Details
Name: | us-gaap_InvestmentCompanyInvestmentIncomeLossRatio
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Market value per share of investment portfolio by investment company. Includes, but is not limited to, per unit, membership interest, or other ownership interest. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-7 + Details
Name: | us-gaap_InvestmentCompanyMarketValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Per share or unit amount of increase (decrease) in net asset value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-7 + Details
Name: | us-gaap_InvestmentCompanyNetAssetValuePerSharePeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of lesser of purchase or sale of portfolio securities to average value of portfolio securities owned. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 27 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-27 + Details
Name: | us-gaap_InvestmentCompanyPortfolioTurnover
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share amount of share repurchase by investment company. Includes, but is not limited to, per unit, membership interest, or other ownership interest. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-7 + Details
Name: | us-gaap_InvestmentCompanyRepurchaseOfSharesPerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage increase (decrease) in fund net asset value, assuming reinvestment of dividends and capital gain distributions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 27 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480990/946-20-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-18 + Details
Name: | us-gaap_InvestmentCompanyTotalReturn
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage increase (decrease) in portfolio market value assuming reinvestment of dividend and capital gain distribution. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-18 + Details
Name: | us-gaap_InvestmentCompanyTotalReturnMarketValue
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Net asset value per share or per unit of investments in certain entities that calculate net asset value per share. Includes, but is not limited to, by unit, membership interest, or other ownership interest. Investment includes, but is not limited to, investment in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. Excludes fair value disclosure. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479168/946-830-55-12 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477796/946-210-45-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-7 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478494/946-205-50-7 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478448/946-505-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.6-05(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-2 + Details
Name: | us-gaap_NetAssetValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_InvestmentTypeAxis=rand_NetRealizedGainLossOfInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=rand_NetChangeInUnrealizedDepreciationAppreciationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |