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Note 7 - Servicing (Details Textual)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
Unpaid Principal Balance of Loans Serviced for Others $ 175,742,000 $ 173,238,000  
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Incremental Increase Based on Loan Count 1    
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Factor 214 136 159
Measurement Input, Inflation Rate of Servicing Costs [Member]      
Servicing Asset, Measurement Input 0.03    
Measurement Input, Earnings Rate [Member]      
Servicing Asset, Measurement Input 0.0025 0.0025 0.0025
Minimum [Member]      
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 11.00%    
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Servicing Costs 76    
Maximum [Member]      
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 13.00%    
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Servicing Costs 91