Note 3 - Inventories (Details Textual) - USD ($)	3 Months Ended	9 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Inventory Abnormal Production Costs	$ 0	$ 0	$ 0	$ 0
Non Inventoriable Fixed Costs	$ 76,000	$ 79,000	$ 113,000	$ 124,000

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