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Loans Receivable, Net (Schedule of non-accrual loans by category) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status $ 6,581,214 $ 5,717,755
FInancing Receivable, Recorded Investment, Nonaccrual Status, Percentage [1] 1.60% 1.50%
Financing Receivable Recorded Investment in Non-accrual Status, Increase (Decrease) $ 863,459  
Financing Receivable Recorded Investment in Non-accrual Status, Percent, Increase (Decrease) 15.10%  
Financing Receivable, Recorded Investment, Past Due $ 10,299,308 $ 6,996,614
Residential Real Estate 1 [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status   $ 1,948,524
FInancing Receivable, Recorded Investment, Nonaccrual Status, Percentage [1] 0.50% 0.50%
Financing Receivable Recorded Investment in Non-accrual Status, Increase (Decrease) $ 70,582  
Financing Receivable Recorded Investment in Non-accrual Status, Percent, Increase (Decrease) 3.60%  
Financing Receivable, Recorded Investment, Past Due $ 1,761,938 $ 1,344,638
Commercial Business [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status   $ 109,401
FInancing Receivable, Recorded Investment, Nonaccrual Status, Percentage [1] 0.00% 0.00%
Financing Receivable Recorded Investment in Non-accrual Status, Increase (Decrease) $ (14,400)  
Financing Receivable Recorded Investment in Non-accrual Status, Percent, Increase (Decrease) (13.20%)  
Financing Receivable, Recorded Investment, Past Due $ 402,620 $ 287,770
Commercial Real Estate 1 [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status   $ 3,340,904
FInancing Receivable, Recorded Investment, Nonaccrual Status, Percentage [1] 1.00% 0.80%
Financing Receivable Recorded Investment in Non-accrual Status, Increase (Decrease) $ 803,935  
Financing Receivable Recorded Investment in Non-accrual Status, Percent, Increase (Decrease) 24.10%  
Financing Receivable, Recorded Investment, Past Due $ 6,973,860 $ 4,491,462
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status   $ 318,926
FInancing Receivable, Recorded Investment, Nonaccrual Status, Percentage [1] 0.10% 0.10%
Financing Receivable Recorded Investment in Non-accrual Status, Increase (Decrease) $ 3,342  
Financing Receivable Recorded Investment in Non-accrual Status, Percent, Increase (Decrease) 1.00%  
Financing Receivable, Recorded Investment, Past Due $ 1,160,890 $ 872,744
[1] PERCENT OF TOTAL LOANS HELD FOR INVESTMENT, NET OF DEFERRED FEES AND LOANS IN PROCESS.