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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: