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Pay vs Performance Disclosure - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Jun. 30, 2024 | Mar. 31, 2025 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Pay vs Performance Disclosure |  |  |  |  |
Pay vs Performance Disclosure, Table |  |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |  | ​ |  | ​ |  | ​ |  | ​ |  | ​ |  | ​ |  | Value of |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Initial Fixed | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | $100 | ​ | ​
​ | ​ | Summary | ​ | ​ | ​ | Summary | ​ | ​ | ​ | Summary | ​ | ​ | ​ | Summary | ​ | Average | ​ | Investment | ​ | ​
​ | ​ | Compensation | ​ | Compensation | ​ | Compensation | ​ | Compensation | ​ | Compensation | ​ | Compensation | ​ | Compensation | ​ | Compensation | ​ | Based on | ​ | ​
​ | ​ | Table | ​ | Actually | ​ | Table | ​ | Actually | ​ | Table | ​ | Actually | ​ | Table | ​ | Actually | ​ | Total | ​ | ​
​ | ​ | Total for | ​ | Paid to | ​ | Total for | ​ | Paid to | ​ | Total for | ​ | Paid to | ​ | Total for | ​ | Paid to | ​ | Shareholder | ​ | ​
​ | ​ | PEO #1 | ​ | PEO #1 | ​ | PEO #2 | ​ | PEO #2 | ​ | PEO #3 | ​ | PEO #3 | ​ | Non-PEO | ​ | Non-PEO | ​ | Return | ​ | ​
Year | ​ | ($)(1) | ​ | ($)(2) | ​ | ($)(1) | ​ | ($)(2) | ​ | ($)(1) | ​ | ($)(1) | ​ | NEOs ($)(1) | ​ | NEOs ($)(2) | ​ | ($)(3) | ​ | Net Income ($)
2025 |  | 1,481,716 |  | 1,609,280 |  | 458,684 |  | 483,033 |  | — |  | — |  | 442,332 |  | 459,921 |  | (17.3) |  | 4,903,000
2024 |  | — |  | — |  | 403,949 |  | 382,111 |  | 264,775 |  | 264,775 |  | 380,390 |  | 362,957 |  | (22.0) |  | 3,799,000
2023 |  | — |  | — |  | — |  | — |  | 922,466 |  | 620,953 |  | 406,203 |  | 340,870 |  | (17.7) |  | 18,069,000
| (1) | During the year ended March 31, 2025, B. Nicole Sherman (PEO #1) and Daniel D. Cox (PEO #2) each served as our principal executive officer (“PEO”). During the year ended March 31, 2024, Daniel D. Cox (PEO #2) and Kevin J. Lycklama (PEO #3) each served as our PEO. For 2023, Kevin J. Lycklama (PEO #3) served as our PEO. The non-PEO named executive officers (non-PEO NEOs) for 2025 are Daniel D. Cox and C. Evan Sowers, for 2024 are C. Evan Sowers and David Lam, and for 2023 are Daniel D. Cox and David Lam.
| (2) | The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K and do not reflect compensation actually earned, realized, or received by Riverview’s NEOs. These amounts reflect the Summary Compensation Table totals with certain adjustments. Adjustments for 2025 are as follows:
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |  | Average of
​ | ​ | ​ | ​ | ​ | ​ | Non-PEO
​ | ​ | PEO #1 ($) | ​ | PEO #2 ($) | ​ | NEOs ($)
Summary Compensation Table total |  | 1,481,716 |  | 458,684 |  | 442,332
Deduction for amounts reported under the Stock Awards column in the Summary Compensation Table |  | 896,060 |  | 63,861 |  | 55,146
Year-end value of equity awards granted during year that remain unvested as of year‑end |  | 878,948 |  | 62,642 |  | 54,093
Year over year change in fair value of outstanding and unvested equity awards |  | 144,676 |  | 19,380 |  | 15,875
Year over year change in fair value of equity awards granted in prior years and vested in the year |  | — |  | 6,188 |  | 2,767
Compensation Actually Paid |  | 1,609,280 |  | 483,033 |  | 459,921
| (3) | Total Shareholder Return assumes $100 invested on March 31, 2022, with all dividends reinvested.
Named Executive Officers, Footnote |  |  |
| (1) | During the year ended March 31, 2025, B. Nicole Sherman (PEO #1) and Daniel D. Cox (PEO #2) each served as our principal executive officer (“PEO”). During the year ended March 31, 2024, Daniel D. Cox (PEO #2) and Kevin J. Lycklama (PEO #3) each served as our PEO. For 2023, Kevin J. Lycklama (PEO #3) served as our PEO. The non-PEO named executive officers (non-PEO NEOs) for 2025 are Daniel D. Cox and C. Evan Sowers, for 2024 are C. Evan Sowers and David Lam, and for 2023 are Daniel D. Cox and David Lam.
Adjustment To PEO Compensation, Footnote |  |  |
| (2) | The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K and do not reflect compensation actually earned, realized, or received by Riverview’s NEOs. These amounts reflect the Summary Compensation Table totals with certain adjustments. Adjustments for 2025 are as follows:
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |  | Average of
​ | ​ | ​ | ​ | ​ | ​ | Non-PEO
​ | ​ | PEO #1 ($) | ​ | PEO #2 ($) | ​ | NEOs ($)
Summary Compensation Table total |  | 1,481,716 |  | 458,684 |  | 442,332
Deduction for amounts reported under the Stock Awards column in the Summary Compensation Table |  | 896,060 |  | 63,861 |  | 55,146
Year-end value of equity awards granted during year that remain unvested as of year‑end |  | 878,948 |  | 62,642 |  | 54,093
Year over year change in fair value of outstanding and unvested equity awards |  | 144,676 |  | 19,380 |  | 15,875
Year over year change in fair value of equity awards granted in prior years and vested in the year |  | — |  | 6,188 |  | 2,767
Compensation Actually Paid |  | 1,609,280 |  | 483,033 |  | 459,921
Non-PEO NEO Average Total Compensation Amount |  |  | $ 442,332 | $ 380,390 | $ 406,203
Non-PEO NEO Average Compensation Actually Paid Amount |  |  | $ 459,921 | 362,957 | 340,870
Adjustment to Non-PEO NEO Compensation Footnote |  |  |
| (2) | The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K and do not reflect compensation actually earned, realized, or received by Riverview’s NEOs. These amounts reflect the Summary Compensation Table totals with certain adjustments. Adjustments for 2025 are as follows:
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |  | Average of
​ | ​ | ​ | ​ | ​ | ​ | Non-PEO
​ | ​ | PEO #1 ($) | ​ | PEO #2 ($) | ​ | NEOs ($)
Summary Compensation Table total |  | 1,481,716 |  | 458,684 |  | 442,332
Deduction for amounts reported under the Stock Awards column in the Summary Compensation Table |  | 896,060 |  | 63,861 |  | 55,146
Year-end value of equity awards granted during year that remain unvested as of year‑end |  | 878,948 |  | 62,642 |  | 54,093
Year over year change in fair value of outstanding and unvested equity awards |  | 144,676 |  | 19,380 |  | 15,875
Year over year change in fair value of equity awards granted in prior years and vested in the year |  | — |  | 6,188 |  | 2,767
Compensation Actually Paid |  | 1,609,280 |  | 483,033 |  | 459,921
Compensation Actually Paid vs. Total Shareholder Return |  |  |  |  |
Compensation Actually Paid vs. Net Income |  |  | ​ |  |
Total Shareholder Return Amount |  |  | $ (17.3) | (22) | (17.7)
Net Income (Loss) |  |  | 4,903,000 | 3,799,000 | 18,069,000
PEO Name | Daniel D. Cox | B. Nicole Sherman |  |  |
B. Nicole Sherman (PEO #1) |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
PEO Total Compensation Amount |  |  | 1,481,716 |  |
PEO Actually Paid Compensation Amount |  |  | 1,609,280 |  |
Daniel D. Cox (PEO #2) |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
PEO Total Compensation Amount |  |  | 458,684 | 403,949 |
PEO Actually Paid Compensation Amount |  |  | 483,033 | 382,111 |
Kevin J. Lycklama (PEO #3) |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
PEO Total Compensation Amount |  |  |  | 264,775 | 922,466
PEO Actually Paid Compensation Amount |  |  |  | $ 264,775 | $ 620,953
PEO | B. Nicole Sherman (PEO #1) | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  | (896,060) |  |
PEO | B. Nicole Sherman (PEO #1) | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  | 878,948 |  |
PEO | B. Nicole Sherman (PEO #1) | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  | 144,676 |  |
PEO | Daniel D. Cox (PEO #2) | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  | (63,861) |  |
PEO | Daniel D. Cox (PEO #2) | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  | 62,642 |  |
PEO | Daniel D. Cox (PEO #2) | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  | 19,380 |  |
PEO | Daniel D. Cox (PEO #2) | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  | 6,188 |  |
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  | (55,146) |  |
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  | 54,093 |  |
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  | 15,875 |  |
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  | $ 2,767 |  |

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