Note 6 - Accounting for Certain Loans Acquired - Carrying Amount of Certain Loans Acquired in Transfer (Details) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Fair value adjustment	$ 775	$ 810

The increase (decrease) to the recorded balance of certain loans acquired in transfer not accounted for as debt securities related to the fair value adjustment.

No definition available.

Name:	gfed_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesFairValueAdjustment
Namespace Prefix:	gfed_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration