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Note 1 - Business Description, Basis of Presentation and Significant Accounting Policies - Deferred Revenue and Associated Costs of Goods Sold and Gross Profit (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred revenue	$ 4,635	$ 3,882
Deferred cost of goods sold	1,555	1,530
Deferred gross profit	$ 3,080	$ 2,352

X

- Definition

Amount of deferred cost of goods sold as of balance sheet date.

+ References

No definition available.

+ Details

Name:	clro_DeferredCostOfGoodsSold
Namespace Prefix:	clro_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of deferred gross profit as of balance sheet date.

+ References

No definition available.

+ Details

Name:	clro_DeferredGrossProfit
Namespace Prefix:	clro_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.A.3)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.A.4(a).Q1)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

+ Details

Name:	us-gaap_DeferredRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant