Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual)	Sep. 30, 2020
Opportunity Bank of Montana [Member]
Noncontrolling Interest, Ownership Percentage by Parent	100.00%
Eagle Bancorp Statutory Trust I [Member]
Noncontrolling Interest, Ownership Percentage by Parent	100.00%
Big Muddy Bancorp Acquisition [Member]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%