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Business Combinations Business Combinations, Pro Forma Information (Details) (Sabine, Inc. [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Sabine, Inc. [Member]
   
Business Combinations, Pro Forma Information [Line Items]    
Business Acquisition, Pro Forma Revenue $ 13,586us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= clro_SabineInc.Member
$ 12,977us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= clro_SabineInc.Member
Business Acquisition, Pro Forma Net Income (Loss) $ 1,272us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= clro_SabineInc.Member
$ 244us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= clro_SabineInc.Member
Business Acquisition, Pro Forma Earnings Per Share, Basic $ 0.14us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= clro_SabineInc.Member
$ 0.03us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= clro_SabineInc.Member
Business Acquisition, Pro Forma Earnings Per Share, Diluted $ 0.13us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= clro_SabineInc.Member
$ 0.03us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= clro_SabineInc.Member