XML 46 R37.htm IDEA: XBRL DOCUMENT
v3.22.2.2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Self-insured employee benefit costs (Details) | 6 Months Ended
--- | ---
Jun. 30, 2022 USD ($)
Minimum |
Additional insurance coverage | $ 100,000
Maximum |
Additional insurance coverage | $ 1,700,000

X
- Definition Amount at the high end of insurance coverage. + References No definition available. + Details
Name: | rvp_AdditionalInsuranceCoverage
Namespace Prefix: | rvp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |