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Note 19 - Fair Value of Financial Instruments and Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
Carrying
    
Estimated
    
Level
  
201
7
  
Amount
    
Fair Value
    
 
1
    
 
2
    
 
3
  
   
(in Thousands)
  
Assets
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Cash and Short-Term Investments
  
$
57,813
    
$
57,813
    
$
57,813
    
$
-
   
$
-
 
Investment Securities Available for Sale
  
 
354,247
    
 
354,247
    
 
-
   
 
346,950
    
 
7,297
  
Federal Home Loan Bank Stock
  
 
3,043
    
 
3,043
    
 
3,043
    
 
-
   
 
-
 
Loans, Net
  
 
757,281
    
 
757,163
    
 
-
   
 
752,287
    
 
4,876
  
Bank-Owned Life Insurance
  
 
17,089
    
 
17,089
    
 
17,089
    
 
-
   
 
-
 
                                         
Liabilities
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Deposits
  
 
1,067,985
    
 
1,068,392
    
 
727,818
    
 
340,574
    
 
-
 
Subordinated Debentures
  
 
24,229
    
 
24,229
    
 
-
   
 
24,229
    
 
-
 
Other Borrowed Money
  
 
47,500
    
 
47,626
    
 
-
   
 
47,626
    
 
-
 
                                         
201
6
                                        
                                         
Assets
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Cash and Short-Term Investments
   $
75,167
     $
75,167
     $
75,167
     $
-
     $
-
  
Investment Securities Available for Sale
    
323,658
      
323,658
      
-
      
323,082
      
576
  
Federal Home Loan Bank Stock
    
3,010
      
3,010
      
3,010
      
-
      
-
  
Loans, Net
    
744,999
      
745,240
      
-
      
738,288
      
6,952
  
Bank-Owned Life Insurance
    
15,419
      
15,419
      
15,419
      
-
      
-
  
                                         
Liabilities
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Deposits
    
1,044,357
      
1,045,726
      
677,129
      
368,597
      
-
  
Subordinated Debentures
    
24,229
      
24,229
      
-
      
24,229
      
-
  
Other Borrowed Money
    
46,000
      
46,232
      
-
      
46,232
      
-
  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
   
 
 
 
  
Fair
Value
Measurements
at
Reporting
Date
Using
  
 
  
Total
Fair
Value
    
Quoted
Prices
in
Active
Markets
for
Identical
Assets
(Level
1)
    
Significant
Other
Observable
Inputs
(Level
2)
    
Significant
Unobservable
Inputs
(Level
3)
  
201
7
                                
                                 
Recurring
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Securities
Available
for
Sale
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. Government Agencies
                                
Mortgage-Backed
  
$
346,723,419
    
$
-
   
$
341,701,288
    
$
5,022,131
  
State, County and Municipal
  
 
4,492,826
    
 
-
   
 
4,277,460
    
 
215,366
  
Corporate
  
 
2,060,000
    
 
-
   
 
-
   
 
2,060,000
  
Asset-Backed
  
 
970,659
    
 
-
   
 
970,659
    
 
-
 
                                 
   
$
354,246,904
    
$
-
   
$
346,949,407
    
$
7,297,497
  
Nonrecurring
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Impaired Loans
  
$
4,875,918
   
$
-
   
$
-
   
$
4,875,918
 
                                 
Other Real Estate
  
$
2,014,904
    
$
-
   
$
-
   
$
2,014,904
  
                                 
2016
                                
                                 
Recurring
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Securities
Available
for
Sale
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. Government Agencies
                                
Mortgage-Backed
   $
319,097,374
     $
-
     $
319,097,374
     $
-
  
State, County and Municipal
    
4,560,496
      
-
      
3,984,112
      
576,384
  
                                 
    $
323,657,870
     $
-
     $
323,081,486
     $
576,384
  
Nonrecurring
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Impaired Loans
   $
6,952,343
     $
-
     $
-
     $
6,952,343
  
                                 
Other Real Estate
   $
2,505,188
     $
-
     $
-
     $
2,505,188
  
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]
   
December
31,
201
7
  
Valuation
Techniques
  
Unobservable
Inputs
  
Range
Weighted
Avg
                         
Real
Estate
                        
C
ommercial Construction
  
$
427,433
  
Sales
Comparison
  
Adjustment
for Differences
  
 
(16.00)%
-
1,975.00%
     
 
  
 
  
Between the Comparable Sales
  
 
 
979.50%
 
                         
     
 
  
 
  
Management
Adjustments for Age
  
 
0.00%
-
10.00%
     
 
  
 
  
of Appraisals and/or Current
 
 
 
5.00%
 
     
 
  
 
  
Market Conditions
    
 
 
 
                         
Residential Real Estate
  
 
81,736
  
Sales
Comparison
  
Adjustment
for Differences
  
 
(43.30)%
-
83.30%
     
 
  
 
  
Between the Comparable Sales
  
 
 
20.00%
 
                         
     
 
  
 
  
Management
Adjustments for Age
  
 
0.00%
-
25.00%
     
 
  
 
  
of Appraisals and/or Current
 
 
 
12.50%
 
     
 
  
 
  
Market Conditions
    
 
 
 
                         
Commercial Real Estate
  
 
4,016,742
  
Income
Approach
  
Management
Adjustments for Age
 
 
0.00%
-
10.00%
     
 
  
 
  
of Appraisals and/or Current
 
 
 
5.00%
 
     
 
  
 
  
Market Conditions
    
 
 
 
                         
     
 
  
 
  
Capitalization
Rate
  
 
 
10.75%
 
                         
Farmland
  
 
350,007
  
Sales
Comparison
  
Adjustment
for Differences
  
 
(71.00)%
-
88.70%
     
 
  
 
  
Between the Comparable Sales
  
 
 
8.85%
 
                         
     
 
  
 
  
Management
Adjustments for Age
 
 
10.00%
-
75.00%
     
 
  
 
  
of Appraisals and/or Current
 
 
 
42.50%
 
     
 
  
 
  
Market Conditions
    
 
 
 
                         
Other
Real Estate Owned
  
 
2,014,904
  
Sales
Comparison
  
Adjustment
for Differences
  
 
(22.74)%
-
15.00%
     
 
  
 
  
Between the Comparable Sales
  
 
 
(3.87)%
 
                         
     
 
  
 
  
Management
Adjustments for Age
 
 
5.44%
-
87.24%
     
 
  
 
  
of Appraisals and/or Current
 
 
 
24.44%
 
     
 
  
 
  
Market Conditions
    
 
 
 
                         
     
 
  
Income
Approach
  
Capitalization
Rate
  
 
 
10.00%
 
   
December
31,
201
6
  
Valuation
Techniques
  
Unobservable
Inputs
  
Range
Weighted
Avg
                         
Real
Estate
                        
C
ommercial Construction
   $
51,161
  
Sales
Comparison
  
Adjustment
for Differences
   
(5.00)%
-
99.00%
     
 
  
 
  
Between the Comparable Sales
    
 
47.00%
 
                         
     
 
  
 
  
Management
Adjustments for Age
   
0.00%
-
10.00%
     
 
  
 
  
of Appraisals and/or Current
   
 
5.00%
 
     
 
  
 
  
Market Conditions
    
 
 
 
                         
Residential Real Estate
    
1,105,312
  
Sales
Comparison
  
Adjustment
for Differences
   
(22.00)%
-
0.00%
     
 
  
 
  
Between the Comparable Sales
    
 
(11.00)%
 
                         
     
 
  
 
  
Management
Adjustments for Age
   
0.00%
-
40.00%
     
 
  
 
  
of Appraisals and/or Current
   
 
20.00%
 
     
 
  
 
  
Market Conditions
    
 
 
 
                         
Commercial Real Estate
    
5,445,192
  
Sales
Comparison
  
Adjustment
for Differences
   
(14.08)%
-
24.62%
     
 
  
 
  
Between the Comparable Sales
    
 
5.27%
 
                         
     
 
  
 
  
Management
Adjustments for Age
   
0.00%
-
100.00%
     
 
  
 
  
of Appraisals and/or Current
   
 
50.00%
 
     
 
  
 
  
Market Conditions
    
 
 
 
                         
     
 
  
Income
Approach
  
Capitalization
Rate
    
 
10.67%
 
                         
Farmland
    
350,678
  
Sales
Comparison
  
Adjustment
for Differences
   
(27.00)%
-
15.00%
     
 
  
 
  
Between the Comparable Sales
    
 
(6.00)%
 
                         
     
 
  
 
  
Management
Adjustments for Age
   
10.00%
-
75.00%
     
 
  
 
  
of Appraisals and/or Current
   
 
42.50%
 
     
 
  
 
  
Market Conditions
    
 
 
 
                         
Other
Real Estate Owned
    
2,505,188
  
Sales
Comparison
  
Adjustment
for Differences
    
(50.80)%
-
316.00%
     
 
  
 
  
Between the Comparable Sales
    
 
132.60%
 
                         
     
 
  
 
  
Management
Adjustments for Age
   
6.25%
-
76.92%
     
 
  
 
  
of Appraisals and/or Current
   
 
36.31%
 
     
 
  
 
  
Market Conditions
    
 
 
 
                         
     
 
  
Income
Approach
  
Discount
Rate
    
 
12.50%
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   
Available
for
Sale
Securities
  
   
201
7
    
201
6
    
201
5
  
                         
Balance,
Beginning
  
$
576,384
     $
930,311
     $
948,390
  
                         
Transfers into Level 3
    
 
      
 
      
-
  
Transfers out of Level 3
    
 
      
 
      
-
  
Securities Purchased During the Year
  
 
7,069,649
      
 
      
-
  
Securities Matured During the Year
  
 
(360,000
)
    
(330,000
 )    
-
  
Loss on OTTI Impairment Included
in Noninterest Income
    
 
      
 
      
-
  
Unrealized Gains(Losses) Included in Other
Comprehensive Income
  
 
11,464
      
(23,927
 )    
(18,079
 )
                         
Balance,
Ending
  
$
7,297,497
     $
576,384
     $
930,311
  
Fair Value, Inputs, Level 3 [Member]  
Notes Tables  
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]
 
December 31, 201
7
  
Fair
Value
  
Valuation
Techniques
  
Unobservable
Inputs
  
Range
(Weighted
Avg)
  
                       
State, County and Municipal
  
$
215,366
  
Discounted
Cash Flow
  
Discount
Rate
or Yield
    
N/A*
  
                       
U. S. Government Agencies Mortgage - Backed
  
 
5,022,131
  
Fundamental Analysis
  
Discount
Rate
or Yield
    
N/A*
  
                       
Corporate
  
 
2,060,000
  
Option Pricing
  
Discount
Rate
or Yield
    
N/A*
  
                       
December 31, 201
6
                      
                       
State, County and Municipal
   $
576,384
  
Discounted Cash Flow
  
Discount Rate or Yield
    
N/A*