Note 2 - Cash, Cash Equivalent, and Investments (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Corporate Debt Securities [Member]
Debt Securities, Held-to-maturity, Premium Paid on Purchase	$ 283,940	$ 196,385	$ 282,946

Represents premium paid on purchase for debt securities held-to-maturity.

No definition available.

Name:	dyai_DebtSecuritiesHeldtomaturityPremiumPaidOnPurchase
Namespace Prefix:	dyai_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration