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Note 8 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Long-term Purchase Commitment, Amount | $ 3,402 |  |
Unrecognized Tax Benefits | 652 | $ 1,189 | $ 1,126
Other Accrued Liabilities, Noncurrent | 927 | 152 |
Litigation for Intellectual Property Infringement [Member] |  |  |
Litigation Settlement, Expense | 408 | $ 1,111 |
Litigation Settlement, Expense Capitalized | $ 2,289 |  |

X
- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees, capitalized during the period. + References No definition available. + Details
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Namespace Prefix: | clro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of expenses incurred but not yet paid classified as other, due after one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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X
- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |