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Note 7 - Stock Plans - Unrecognized Stock-based Compensation Expense (Details) $ in Thousands	Mar. 31, 2024 USD ($)
Unrecognized stock-based compensation expense	$ 2,434
The 2012 Director Stock Incentive Plan [Member]
Unrecognized stock-based compensation expense	210
The 2012 Omnibus Stock Incentive Plan [Member]
Unrecognized stock-based compensation expense	216
The 2022 Omnibus Stock Incentive Plan [Member]
Unrecognized stock-based compensation expense	$ 2,008

X

- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_PlanNameAxis=fdbc_The2012DirectorStockIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PlanNameAxis=fdbc_The2012OmnibusStockIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PlanNameAxis=fdbc_The2022OmnibusStockIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: