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Note 8 - Shareholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions	Feb. 21, 2018	Mar. 01, 2017	Mar. 09, 2016
Stock Repurchase Program, Authorized Amount			$ 10
Stock Repurchase Program, Additional Authorized Amount		$ 10
Common Stock, Dividends, Per Share, Declared	$ 0.07
Dividends Payable, Date to be Paid	Mar. 21, 2018
Dividends Payable, Date of Record	Mar. 07, 2018

X

- Definition

Amount of additional stock repurchase plan authorized in a renewed and extended stock repurchase program.

+ References

No definition available.

+ Details

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

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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