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Note 2 - Cash, Cash Equivalents, and Investments (Details Textual) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Corporate Debt Securities [Member]
Debt Securities, Held-to-maturity, Premium Paid on Purchase	$ 0	$ 24,771	$ 283,940	$ 221,156	$ 282,946

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: