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Note 13 - Income Taxes (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   34.00%  
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   $ 290,000  
Reclassification from AOCI to Retained Earnings for Change in Federal Tax Rate    
Unrecognized Tax Benefits   0 $ 0
Retained Earnings, Appropriated   909,000 909,000
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Bad Debt Reserve for Tax Purposes of Qualified Lender   191,000 $ 309,000
Retained Earnings [Member]      
Reclassification from AOCI to Retained Earnings for Change in Federal Tax Rate   352,000  
Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member]      
Reclassification from AOCI to Retained Earnings for Change in Federal Tax Rate   352,000  
AOCI Attributable to Parent [Member]      
Reclassification from AOCI to Retained Earnings for Change in Federal Tax Rate   (352,000)  
AOCI Attributable to Parent [Member] | Accounting Standards Update 2018-02 [Member]      
Reclassification from AOCI to Retained Earnings for Change in Federal Tax Rate   $ (352,000)  
Scenario, Forecast [Member]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%