Note 15 - Subsequent Events (Details Textual)	Oct. 16, 2017 $ / shares
Subsequent Event [Member]
Merger Agreement, Right to Receive, Cash Per Share	$ 2.40

Per share amount to be received by the shareholders for each share of common stock pursuant to the merger agreement.

No definition available.

Name:	rt_MergerAgreementRightToReceiveCashPerShare
Namespace Prefix:	rt_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant