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N-2 - USD ($)
 3 Months Ended
Aug. 24, 2023
Aug. 02, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Cover [Abstract]                                      
Entity Central Index Key 0001746967                                    
Amendment Flag false                                    
Document Type 424B5                                    
Entity Registrant Name RiverNorth Opportunistic Municipal Income Fund, Inc.                                    
Fee Table [Abstract]                                      
Shareholder Transaction Expenses [Table Text Block]

 

Common Shareholder Transaction Expenses As a Percentage
of Offering Price
Sales Load(1) 1.00%
Offering Expenses Borne by Common Shareholders of the Fund 0.13%
Dividend Reinvestment Plan Fees(2) None
                                    
Sales Load [Percent] [1] 1.00%                                    
Dividend Reinvestment and Cash Purchase Fees [2] $ 0                                    
Other Transaction Expenses [Abstract]                                      
Other Transaction Expenses [Percent] 0.13%                                    
Annual Expenses [Table Text Block]

 

Annual Expenses As a Percentage of Net Assets Attributable to Common Shares
Management fee(3) 1.82%
Leverage costs(4)(5)(6) 1.84%
Other expenses 0.61%
Acquired fund fees and expenses(7) 0.86%
Total annual expenses 5.13%
                                    
Management Fees [Percent] [3] 1.82%                                    
Interest Expenses on Borrowings [Percent] [4],[5],[6] 1.84%                                    
Acquired Fund Fees and Expenses [Percent] [7] 0.86%                                    
Other Annual Expenses [Abstract]                                      
Other Annual Expenses [Percent] 0.61%                                    
Total Annual Expenses [Percent] 5.13%                                    
Expense Example [Table Text Block]

Example (8)

 

The purpose of the following table is to help a holder of Common Shares understand the fees and expenses that such holder would bear directly or indirectly. The following example illustrates the expenses you would pay on a $1,000 investment in Common Shares in the offering, assuming (1) payment in year 1 of a commission of 1.00% on the investment and estimated offering costs of $84,400, (2) “Total annual expenses” of 5.13% of net assets in years 1 through 10, and (3) a 5% annual return.

 

  1 year 3 years 5 years 10 years
Total Expenses Incurred $61 $162 $263 $514

 

The example should not be considered a representation of future expenses. Actual expenses may be greater or less than those assumed.

                                    
Expense Example, Year 01 [8] $ 61                                    
Expense Example, Years 1 to 3 [8] 162                                    
Expense Example, Years 1 to 5 [8] 263                                    
Expense Example, Years 1 to 10 [8] $ 514                                    
Purpose of Fee Table , Note [Text Block] The following table is intended to assist investors in understanding the fees and expenses (annualized) that an investor in Common Shares would bear, directly or indirectly.                                    
Basis of Transaction Fees, Note [Text Block]

SUMMARY OF FUND EXPENSES

 

The following table is intended to assist investors in understanding the fees and expenses (annualized) that an investor in Common Shares would bear, directly or indirectly. The table is based on the capital structure of the Fund as of December 31, 2022. As of such date, the Fund had $10,000,000 of leverage outstanding pursuant to the Pershing Facility (as defined in the accompanying Prospectus), which represented 5.15% of Managed Assets as of December 31, 2022. The table assumes the use of leverage from borrowings and the proceeds of tender option bond transactions representing, in the aggregate, 43.12% of Managed Assets at a weighted average annual expense to the Fund of 2.57%. Actual expenses may be greater or less than those shown below.

 

The table shows Fund expenses as a percentage of net assets attributable to Common Shares as of December 31, 2022 and not as a percentage of gross assets or managed assets. The following table should not be considered a representation of the Fund’s future expenses. Actual expenses may be greater or less than those shown below.

 

Common Shareholder Transaction Expenses As a Percentage
of Offering Price
Sales Load(1) 1.00%
Offering Expenses Borne by Common Shareholders of the Fund 0.13%
Dividend Reinvestment Plan Fees(2) None

 

 

Annual Expenses As a Percentage of Net Assets Attributable to Common Shares
Management fee(3) 1.82%
Leverage costs(4)(5)(6) 1.84%
Other expenses 0.61%
Acquired fund fees and expenses(7) 0.86%
Total annual expenses 5.13%

 

                                    
Management Fee not based on Net Assets, Note [Text Block] The management fee is charged as a percentage of the Fund’s average daily Managed Assets, as opposed to net assets. With leverage, Managed Assets are greater in amount than net assets, because Managed Assets include assets attributable to the Fund’s use of leverage created by its borrowings and tender option bond transactions. In addition, the mark-to-market value of the Fund’s derivatives will be used for purposes of calculating Managed Assets. The management fee of 1.05% of the Fund’s Managed Assets represents 1.82% of net assets attributable to Common Shares assuming the use of leverage in an amount of 43.12% of the Fund’s Managed Assets.                                    
Acquired Fund Fees Estimated, Note [Text Block] The “Acquired fund fees and expenses” disclosed above are based on the expense ratios for the most recent fiscal year of the Underlying Funds in which the Fund has invested, which may change substantially over time and, therefore, significantly affect “Acquired fund fees and expenses.” These amounts are based on the total expense ratio disclosed in each Underlying Fund’s most recent shareholder report. “Acquired fund fees and expenses” are not charged directly to the Fund, but rather reflect the estimated pro rata portion of the Underlying Funds’ fees attributable to the Fund’s investments in shares of the Underlying Funds. The 0.86% shown as “Acquired fund fees and expenses” reflects estimated operating expenses of the Underlying Funds and transaction-related fees. Certain Underlying Funds in which the Fund intends to invest generally charge management fees of 1.00% to 2.00%, which are included in “Acquired fund fees and expenses,” as applicable. Acquired fund fees and expenses are borne indirectly by the Fund, but they are not reflected in the Fund’s financial statements; and the information presented in the table will differ from that presented in the Fund’s financial highlights.                                    
General Description of Registrant [Abstract]                                      
Share Price [Table Text Block]

 

  MARKET PRICE NET ASSET VALUE

PREMIUM/(DISCOUNT)

TO NET ASSET VALUE

Quarter Ended High Low High Low High Low
June 30, 2019 $21.92 $20.60 $22.61 $22.12 -3.05% -6.87%
September 30, 2019 $22.84 $21.31 $23.50 $22.75 -2.81% -6.33%
December 31, 2019 $22.68 $21.54 $23.23 $22.78 -2.37% -5.44%
March 31, 2020 $23.45 $16.59 $23.92 $18.04 -1.96% -8.04%
June 30, 2020 $21.31 $19.07 $22.29 $20.19 -4.40% -5.55%
September 30, 2020 $21.74 $20.25 $23.40 $22.56 -7.09% -10.24%
December 31, 2020 $21.64 $20.15 $23.48 $22.53 -7.84% -10.56%
March 31, 2021 $22.10 $21.02 $23.85 $23.13 -7.36% -9.12%
June 30, 2021 $23.40 $22.05 $24.41 $23.62 -4.14% -6.65%
September 30, 2021 $24.00 $22.85 $24.49 $23.78 -2.00% -3.92%
December 31, 2021 $23.30 $21.46 $23.69 $22.59 -1.65% -5.00%
March 31, 2022 $22.24 $18.31 $22.73 $19.46 -2.16% -5.91%
June 30, 2022 $19.29 $15.52 $19.32 $17.12 -0.16% -9.35%
September 30, 2022 $18.77 $15.61 $18.67 $16.97 0.54% -8.01%
December 31, 2022 $18.00 $14.64 $17.52 $16.19 2.74% -9.57%
March 31, 2023 $18.75 $15.70 $17.97 $17.06  4.34%  -7.97%
June 30, 2023 $17.04 $15.50 $17.56 $16.72 -2.96% -7.30%

                                    
Capital Stock, Long-Term Debt, and Other Securities [Abstract]                                      
Outstanding Securities [Table Text Block]

 

The following table provides information about the Fund’s outstanding securities as of August 2, 2023:

 

(1) (2) (3) (4)
Title of Class Amount Authorized

Amount Held by Fund or for

its account

Amount Outstanding

Exclusive of Amount Shown

under (3)

As of August 2, 2023

Common Stock 50,000,000 None 6,374,539
                                    
Common Shares [Member]                                      
General Description of Registrant [Abstract]                                      
Lowest Price or Bid     $ 15.50 $ 15.70 $ 14.64 $ 15.61 $ 15.52 $ 18.31 $ 21.46 $ 22.85 $ 22.05 $ 21.02 $ 20.15 $ 20.25 $ 19.07 $ 16.59 $ 21.54 $ 21.31 $ 20.60
Highest Price or Bid     17.04 18.75 18.00 18.77 19.29 22.24 23.30 24.00 23.40 22.10 21.64 21.74 21.31 23.45 22.68 22.84 21.92
Lowest Price or Bid, NAV     16.72 17.06 16.19 16.97 17.12 19.46 22.59 23.78 23.62 23.13 22.53 22.56 20.19 18.04 22.78 22.75 22.12
Highest Price or Bid, NAV     $ 17.56 $ 17.97 $ 17.52 $ 18.67 $ 19.32 $ 22.73 $ 23.69 $ 24.49 $ 24.41 $ 23.85 $ 23.48 $ 23.40 $ 22.29 $ 23.92 $ 23.23 $ 23.50 $ 22.61
Highest Price or Bid, Premium (Discount) to NAV [Percent]     (2.96%) 4.34% 2.74% 0.54% (0.16%) (2.16%) (1.65%) (2.00%) (4.14%) (7.36%) (7.84%) (7.09%) (4.40%) (1.96%) (2.37%) (2.81%) (3.05%)
Lowest Price or Bid, Premium (Discount) to NAV [Percent]     (7.30%) (7.97%) (9.57%) (8.01%) (9.35%) (5.91%) (5.00%) (3.92%) (6.65%) (9.12%) (10.56%) (10.24%) (5.55%) (8.04%) (5.44%) (6.33%) (6.87%)
Latest Share Price   $ 16.79                                  
Latest Premium (Discount) to NAV [Percent]   2.16%                                  
Latest NAV   $ 17.16                                  
Capital Stock, Long-Term Debt, and Other Securities [Abstract]                                      
Outstanding Security, Title [Text Block]   Common Stock                                  
Outstanding Security, Authorized [Shares]   50,000,000                                  
Outstanding Security, Held [Shares]   0                                  
Outstanding Security, Not Held [Shares]   6,374,539                                  
[1] Represents the estimated maximum commission with respect to the Common Shares being sold under this Prospectus Supplement and the accompanying Prospectus. There is no guarantee that there will be any sales of Common Shares under this Prospectus Supplement and the accompanying Prospectus. Actual sales of Common Shares under this Prospectus Supplement and the accompanying Prospectus, if any, may be less than as set forth under “Capitalization” below. In addition, the price per Common Share of any such sale may be greater or less than the price set forth under “Capitalization” above, depending on market price of the Common Shares at the time of any such sale.
[2] There will be no brokerage charges with respect to Common Shares issued directly by the Fund under the dividend reinvestment plan. You may pay brokerage charges in connection with open market purchases or if you direct the plan agent to sell your Common Shares held in a dividend reinvestment account.
[3] The management fee is charged as a percentage of the Fund’s average daily Managed Assets, as opposed to net assets. With leverage, Managed Assets are greater in amount than net assets, because Managed Assets include assets attributable to the Fund’s use of leverage created by its borrowings and tender option bond transactions. In addition, the mark-to-market value of the Fund’s derivatives will be used for purposes of calculating Managed Assets. The management fee of 1.05% of the Fund’s Managed Assets represents 1.82% of net assets attributable to Common Shares assuming the use of leverage in an amount of 43.12% of the Fund’s Managed Assets.
[4] Interest and fees on leverage in the table reflect the cost to the Fund of borrowings and tender option bond transactions, expressed as a percentage of the Fund’s net assets as of December 31, 2022, based on interest rates in effect as of December 31, 2022. The table assumes the use of leverage from borrowings and the proceeds of tender option bond transactions representing, in the aggregate, 43.12% of Managed Assets at a weighted average annual expense to the Fund of 2.57%.
[5] The actual amount of interest expense borne by the Fund will vary over time in accordance with the level of the Fund’s use of leverage and variations in market interest rates.
[6] The “Leverage costs” include the expenses associated with the Fund’s tender option bond transactions, including remarketing, administration and trustee services to a TOB Issuer.
[7] The “Acquired fund fees and expenses” disclosed above are based on the expense ratios for the most recent fiscal year of the Underlying Funds in which the Fund has invested, which may change substantially over time and, therefore, significantly affect “Acquired fund fees and expenses.” These amounts are based on the total expense ratio disclosed in each Underlying Fund’s most recent shareholder report. “Acquired fund fees and expenses” are not charged directly to the Fund, but rather reflect the estimated pro rata portion of the Underlying Funds’ fees attributable to the Fund’s investments in shares of the Underlying Funds. The 0.86% shown as “Acquired fund fees and expenses” reflects estimated operating expenses of the Underlying Funds and transaction-related fees. Certain Underlying Funds in which the Fund intends to invest generally charge management fees of 1.00% to 2.00%, which are included in “Acquired fund fees and expenses,” as applicable. Acquired fund fees and expenses are borne indirectly by the Fund, but they are not reflected in the Fund’s financial statements; and the information presented in the table will differ from that presented in the Fund’s financial highlights.
[8] The example should not be considered a representation of future expenses and includes the expenses of the offering. The example assumes that the estimated “Other expenses” set forth in the table are accurate and that all dividends and distributions are reinvested at the Common Share NAV and that the Fund is engaged in leverage of 43.12% of Managed Assets, assuming interest and fees on leverage of 1.84%. The interest and fees on leverage is expressed as an interest rate and represents interest and fees payable pursuant to the Pershing Facility, as well as interest and fees payable for the Fund’s tender option bond transactions. Actual expenses may be greater or less than those assumed. Moreover, the Fund’s actual rate of return may be greater or less than the hypothetical 5% annual return shown in the example.