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Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual)
3 Months Ended
Oct. 31, 2025
USD ($)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration]   Other Assets   Other Assets
Investment, Proportional Amortization Method, Elected, Amount   $ 5,767,000   $ 5,963,000
Investment Program, Proportional Amortization Method, Elected, Commitment   $ 166,000   166,000
Number of Stores   30    
Goodwill, Impairment Loss $ 0      
Number of Operating Segments   1    
Number of Reportable Segments   1    
Commodity Sales [Member]        
Revenue from Contract with Customer, Including Assessed Tax   $ 2,151,000 $ 2,314,000  
Cost of Product and Service Sold   2,151,000 2,314,000  
Gross Profit   0 $ 0  
Contract with Customer, Liability   $ 14,135,000   $ 23,549,000
Opportunity Bank of Montana [Member]        
Subsidiary, Ownership Percentage, Parent   100.00%    
Eagle Bancorp Statutory Trust I [Member]        
Subsidiary, Ownership Percentage, Parent   100.00%