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Note 9 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		12 Months Ended
	May 31, 2023	Sep. 30, 2019	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Government Assistance, Amount			$ 286	$ 314
Grant Funding Related to VISIONARY-MS Phase 2 Clinical Trial [Member] | National Multiple Sclerosis Society [Member]
Government Assistance, Amount		$ 300
Government Assistance, Repayment, Percentage of Grant Funding Upon First Commercial Product Sale		50.00%
Government Assistance, Repayment, Additional Percentage of Grant Funding, Tranche One		50.00%
Government Assistance, Repayment, Cumulative Sales, Tranche One		$ 10,000
Government Assistance, Repayment, Cumulative Sales, Tranche Two		$ 50,000
Government Assistance, Repayment, Additional Percentage of Grant Funding, Tranche Three		200.00%
Government Assistance, Repayment, Cumulative Sales, Tranche Three		$ 100,000
Government Assistance, Repayment, Maximum Percentage of Grant Funding When All Milestones Achieved		450.00%
Government Assistance, Aggregate Repayment, Percentage of Grant Funding		300.00%
Government Assistance, Repayment, Percentage of Grant Funding Upon Closing		300.00%
Government Assistance, Repayment Amount Upon Closing		$ 1,000
Grant Funding Related to VISIONARY-MS Phase 2 Clinical Trial [Member] | National Multiple Sclerosis Society [Member] | Minimum [Member]
Government Assistance, Possible Loss, Percentage of Grant Funding		50.00%
Government Assistance, Possible Loss Between Minimum and Maximum Repayment Amounts		$ 200
Grant Funding Related to VISIONARY-MS Phase 2 Clinical Trial [Member] | National Multiple Sclerosis Society [Member] | Maximum [Member]
Government Assistance, Possible Loss, Percentage of Grant Funding		450.00%
Government Assistance, Possible Loss Between Minimum and Maximum Repayment Amounts		$ 1,500
Grant Funding Related to REPAIR-MS Phase 2 Clinical Trial [Member] | National Multiple Sclerosis Society [Member]
Government Assistance, Amount	$ 700
Government Assistance, Repayment, Additional Percentage of Grant Funding, Tranche Two		150.00%
Government Assistance, Aggregate Repayment, Percentage of Grant Funding	150.00%
Government Assistance, Repayment, Percentage of Grant Funding Upon Closing	150.00%
Government Assistance, Repayment Amount Upon Closing	$ 1,000
Grant Funding Related to REPAIR-MS Phase 2 Clinical Trial [Member] | National Multiple Sclerosis Society [Member] | Minimum [Member]
Government Assistance, Possible Loss Between Minimum and Maximum Repayment Amounts	300
Grant Funding Related to REPAIR-MS Phase 2 Clinical Trial [Member] | National Multiple Sclerosis Society [Member] | Maximum [Member]
Government Assistance, Possible Loss Between Minimum and Maximum Repayment Amounts	$ 3,000
Capital Addition Purchase Commitments [Member]
Long-Term Purchase Commitment, Amount			$ 200		$ 400

X

- Definition

Represents aggregate amount of repayment of the grant as a percentage of the fund.

+ References

No definition available.

+ Details

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Namespace Prefix:	clnn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Reflects the estimated amount of loss from minimum and maximum repayment amount.

+ References

No definition available.

+ Details

Name:	clnn_GovernmentAssistancePossibleLossBetweenMinimumAndMaximumRepaymentAmounts
Namespace Prefix:	clnn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents possible loss between repayment amounts as a percentage of the grant funding.

+ References

No definition available.

+ Details

Name:	clnn_GovernmentAssistancePossibleLossPercentageOfGrantFunding
Namespace Prefix:	clnn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents additional payment of the grant as a percentage of the fund, tranche one.

+ References

No definition available.

+ Details

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Namespace Prefix:	clnn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents additional payment of the grant as a percentage of the fund, tranche three.

+ References

No definition available.

+ Details

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Namespace Prefix:	clnn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents additional payment of the grant as a percentage of the fund, tranche two.

+ References

No definition available.

+ Details

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Namespace Prefix:	clnn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Repayment amount of the grant needed upon closing.

+ References

No definition available.

+ Details

Name:	clnn_GovernmentAssistanceRepaymentAmountUponClosing
Namespace Prefix:	clnn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Cumulative sales amount required to repay additional grant funding, tranche one.

+ References

No definition available.

+ Details

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Namespace Prefix:	clnn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Cumulative sales amount required to repay additional grant funding, tranche three.

+ References

No definition available.

+ Details

Name:	clnn_GovernmentAssistanceRepaymentCumulativeSalesTrancheThree
Namespace Prefix:	clnn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Cumulative sales amount required to repay additional grant funding, tranche two.

+ References

No definition available.

+ Details

Name:	clnn_GovernmentAssistanceRepaymentCumulativeSalesTrancheTwo
Namespace Prefix:	clnn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents additional payment of the grant as a percentage of the fund if all milestones are achieved.

+ References

No definition available.

+ Details

Name:	clnn_GovernmentAssistanceRepaymentMaximumPercentageOfGrantFundingWhenAllMilestonesAchieved
Namespace Prefix:	clnn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents amount of repayment needed upon closing as a percentage of the grant funding.

+ References

No definition available.

+ Details

Name:	clnn_GovernmentAssistanceRepaymentPercentageOfGrantFundingUponClosing
Namespace Prefix:	clnn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents repayment amount of the grant as a percentage of grant funding upon first commercial product sale.

+ References

No definition available.

+ Details

Name:	clnn_GovernmentAssistanceRepaymentPercentageOfGrantFundingUponFirstCommercialProductSale
Namespace Prefix:	clnn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase (decrease) in income from government assistance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 832
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483507/832-10-50-3

+ Details

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

X

- Details

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X

- Details

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Period Type:

X

- Details

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X

- Details

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X

- Details

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X

- Details

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