Note 3 - Inventories (Details Textual) - USD ($)	3 Months Ended	6 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Non Inventoriable Fixed Costs	$ 17,000	$ 85,000	$ 46,000	$ 100,000

Represents the non-inventoriable fixed costs incurred during the period.

No definition available.

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