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Note 1 - Summary of Significant Accounting Policies (Details Textual)
12 Months Ended
Dec. 31, 2018
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2017
USD ($)
Real Estate Acquired Through Foreclosure $ 701,000   $ 492,000
Mortgage Loans in Process of Foreclosure, Amount $ 811,000   $ 948,000
Number of Operating Segments 1    
Subsequent Event [Member] | Accounting Standards Update 2016-02 [Member]      
Operating Lease, Right-of-Use Asset   $ 1,700,000  
Operating Lease, Liability, Total   $ 1,700,000  
Customer Relationships [Member]      
Finite-Lived Intangible Asset, Useful Life 2 years    
Building [Member] | Minimum [Member]      
Property, Plant and Equipment, Useful Life 25 years    
Building [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life 40 years    
Furniture and Fixtures [Member] | Minimum [Member]      
Property, Plant and Equipment, Useful Life 3 years    
Furniture and Fixtures [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life 10 years