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Business Combination, Goodwill and Intangibles Business Combinations (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014
Business Acquisition, Pro Forma Information [Line Items]
Revenue	$ 57,909us-gaap_SalesRevenueNet	$ 49,592us-gaap_SalesRevenueNet
Net income	5,596us-gaap_NetIncomeLoss	5,179us-gaap_NetIncomeLoss
Spontania [Member]
Business Acquisition, Pro Forma Information [Line Items]
Business Acquisition, Pro Forma Revenue			753us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = clro_SpontaniaMember
Business Acquisition, Pro Forma Net Income (Loss)			(1,629)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = clro_SpontaniaMember
Sabine, Inc. [Member]
Business Acquisition, Pro Forma Information [Line Items]
Revenue	3,841us-gaap_SalesRevenueNet / us-gaap_BusinessAcquisitionAxis = clro_SabineInc.Member
Net income	619us-gaap_NetIncomeLoss / us-gaap_BusinessAcquisitionAxis = clro_SabineInc.Member
Business Acquisition, Pro Forma Revenue	58,178us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = clro_SabineInc.Member	53,003us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = clro_SabineInc.Member
Business Acquisition, Pro Forma Net Income (Loss)	$ 5,356us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = clro_SabineInc.Member	$ 5,020us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = clro_SabineInc.Member
Basic earnings per common share	$ 0.58us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = clro_SabineInc.Member	$ 0.55us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = clro_SabineInc.Member
Diluted earnings per common share	$ 0.56us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = clro_SabineInc.Member	$ 0.53us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = clro_SabineInc.Member

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