Note 15 - Commitments and Contingencies (Details Textual)	12 Months Ended
Dec. 31, 2022 USD ($)
Ashland, Inc. [Member]
Long-Term Purchase Commitment, Annual Minimum Purchase Required	$ 2,940,000

The annual minimum purchase amount required the entity agreed to spend under the long-term purchase commitment.

No definition available.

Name:	ctdh_LongtermPurchaseCommitmentAnnualMinimumPurchaseRequired
Namespace Prefix:	ctdh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration