Note 3 - Inventories (Details Textual) - USD ($)	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Inventory Abnormal Production Costs	$ 0	$ 250,000	$ 538,000
Non Inventoriable Fixed Costs	$ 343,000	$ 176,000	$ 271,000

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