Note 3 - Inventories (Details Textual) - USD ($)	3 Months Ended	6 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Inventory Abnormal Production Costs	$ 31,000	$ 0	$ 53,000	$ 133,000
Non Inventoriable Fixed Costs	$ 15,000	$ 136,000	$ 83,000	$ 325,000

Represents the amount of abnormal production costs charged to cost of sales.

No definition available.

Name:	cyan_InventoryAbnormalProductionCosts
Namespace Prefix:	cyan_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration