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Note 11 - Subsequent Events (Details Textual) - Subsequent Event [Member]	Nov. 05, 2018 $ / shares shares
Common Stock, Shares Authorized Per Shareholder, Basic Subscription Right | shares	1
Share Price | $ / shares	$ 1.20
Common Stock, Shares Authorized, Basic Subscription Right | shares	8,306,535
Share Price After Exercise of Basic Subscription Right | $ / shares	$ 1.20

X

- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws for a basic subscription right.

+ References

No definition available.

+ Details

Name:	clro_CommonStockSharesAuthorizedBasicSubscriptionRight
Namespace Prefix:	clro_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of shares permitted to be issued to each shareholder as a basic subscription right.

+ References

No definition available.

+ Details

Name:	clro_CommonStockSharesAuthorizedPerShareholderBasicSubscriptionRight
Namespace Prefix:	clro_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Price of a single share of stock, if a shareholder has exercised their full basic subscription right.

+ References

No definition available.

+ Details

Name:	clro_SharePriceAfterExerciseOfBasicSubscriptionRight
Namespace Prefix:	clro_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: