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Note 11 - Other Borrowings and Unused Lines of Credit (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Debt [Table Text Block]
   
2017
   
2016
 
                 
Wholesale structured repurchase agreements
  $
35,000,000
    $
45,000,000
 
Term notes
   
31,000,000
     
30,000,000
 
Revolving line of credit
   
-
     
5,000,000
 
    $
66,000,000
    $
80,000,000
 
Schedule of Wholesale Repurchase Agreements [Table Text Block]
   
2017
   
2016
 
U.S. govt. sponsored agency securities
  $
3,474,555
    $
20,798,703
 
Residential mortgage-backed and related securities
   
61,528,167
     
31,321,028
 
Total securities pledged to wholesale customer repurchase agreements
   
65,002,722
     
52,119,731
 
Less: overcollateralized position
   
30,002,722
     
7,119,731
 
    $
35,000,000
    $
45,000,000
 
Schedule of Prepayments of Debt [Table Text Block]
2016
 
Date of Restructuring
 
Amount
   
Weighted
Average
Interest Rate
 
Range of Maturity Dates
 
Prepayment
Fees
 
                           
First Quarter of 2016
  $
10,000,000
     
3.97
%
July 2018
  $
759,000
 
Third Quarter of 2016
   
55,000,000
     
3.27
%
February 2019 to September 2020
   
4,010,000
 
Total for 2016
  $
65,000,000
     
3.38
%
 
  $
4,769,000
 
Schedule of Line of Credit Facilities [Table Text Block]
   
December 31, 2017
 
December 31, 2016
 
           
Weighted
         
Weighted
 
           
Average
         
Average
 
           
Interest Rate
         
Interest Rate
 
   
Amount Due
   
at Year-End
 
Amount Due
   
at Year-End
 
Maturity:
                               
Year ending December 31:
                               
2017
  $
-
     
-
    $
10,000,000
   
3.00
%  
2019
   
10,000,000
     
3.44
     
10,000,000
   
3.44
   
2020
   
25,000,000
     
2.48
     
25,000,000
   
2.48
   
Total Wholesale Structured Repurchase Agreements
  $
35,000,000
     
2.76
%   $
45,000,000
   
2.81
%  
Schedule of Maturities of Long-term Debt [Table Text Block]
   
As of December 31, 2017
 
2018
  $
7,750,000
 
2019
   
7,750,000
 
2020
   
7,750,000
 
2021
   
7,750,000
 
    $
31,000,000
 
Whole sale Repurchase Agreements [Member]  
Notes Tables  
Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets [Table Text Block]
   
2017
   
2016
 
                 
Secured
  $
2,967,441
    $
34,409,192
 
Unsecured
   
372,000,000
     
347,000,000
 
    $
374,967,441
    $
381,409,192