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Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) (USD $) | 6 Months Ended
--- | ---
Jun. 30, 2014 | Jun. 30, 2013
Statement Of Stockholders' Equity [Abstract] |  |
Dividend common stock, Per share amount | $ 0.075 | $ 0.025

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- Definition Dividend common stock per share amount. + References No definition available. + Details
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Namespace Prefix: | rbnf_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration