Note 5 - Accounting for Certain Loans Acquired (Details Textual) $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Full Payoff of Certain Purchased Credit Impaired Loans	$ 4.9
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion Due to Payoff	$ 1.8

The amount of unexpected full payoffs of certain purchased credit impaired loans. This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

No definition available.

Name:	gfed_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesFullPayoffOfCertainPurchasedCreditImpairedLoans
Namespace Prefix:	gfed_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration