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Note 23 - Capitalization and Capital Reduction (Details Textual)	Jul. 25, 2017 shares
Statement Line Items [Line Items]
Deferred shares issued	1

X

- Definition

The number of deferred shares issued.

+ References

No definition available.

+ Details

Name:	rhyth_DeferredSharesIssued
Namespace Prefix:	rhyth_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	rhyth_StatementLineItems
Namespace Prefix:	rhyth_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration