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Note 15 - Related Party Transactions (Details Textual) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Aug. 31, 2018 | Mar. 31, 2024
Related Party Transaction, Royalty Fee Rate for Revenues | 3.00% |
Supply Agreement [Member] | 4Life [Member] |  |
Related Party Transaction, Rate | 20.00% |
License Agreement [Member] | 4Life [Member] |  |
Related Party Transaction, Exclusive Supply Term (Year) |  | 5 years

X
- Definition Represents the exclusive supply term with a related party. + References No definition available. + Details
Name: | clnn_RelatedPartyTransactionExclusiveSupplyTerm
Namespace Prefix: | clnn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of royalty fee for revenues in related party transaction. + References No definition available. + Details
Name: | clnn_RelatedPartyTransactionRoyaltyFeeRateForRevenues
Namespace Prefix: | clnn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=clnn_SupplyAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=clnn_FourLifeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=clnn_LicenseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |