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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, 2018	Dec. 31, 2017
Deferred revenue	$ 283	$ 4,635
Deferred cost of goods sold		1,555
Deferred gross profit	$ 283	$ 3,080

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

No definition available.

+ Details

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