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Note 2 - Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Unrealized Gain (Loss) on Investments [Table Text Block]
           
Gross
    
Gross
          
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
(Losses)
    
Value
  
June 30, 2017:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Securities HTM:
                                
Municipal securities
   $
323,153,634
     $
2,027,969
     $
(3,242,226
 )   $
321,939,377
  
Other securities
    
1,050,000
      
-
      
-
      
1,050,000
  
    $
324,203,634
     $
2,027,969
     $
(3,242,226
 )   $
322,989,377
  
                                 
Securities AFS:
                                
U.S. govt. sponsored agency securities
   $
42,037,160
     $
96,651
     $
(189,347
 )   $
41,944,464
  
Residential mortgage-backed and related securities
    
166,063,973
      
245,551
      
(1,894,691
 )    
164,414,833
  
Municipal securities
    
57,881,338
      
471,713
      
(252,541
 )    
58,100,510
  
Other securities
    
4,065,468
      
778,988
      
(22,550
 )    
4,821,906
  
    $
270,047,939
     $
1,592,903
     $
(2,359,129
 )   $
269,281,713
  
                                 
December 31, 2016:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Securities HTM:
                                
Municipal securities
   $
321,859,056
     $
2,200,577
     $
(4,694,734
 )   $
319,364,899
  
Other securities
    
1,050,000
      
-
      
-
      
1,050,000
  
    $
322,909,056
     $
2,200,577
     $
(4,694,734
 )   $
320,414,899
  
                                 
Securities AFS:
                                
U.S. govt. sponsored agency securities
   $
46,281,306
     $
132,886
     $
(330,585
 )   $
46,083,607
  
Residential mortgage-backed and related securities
    
150,465,222
      
174,993
      
(2,938,088
 )    
147,702,127
  
Municipal securities
    
52,816,541
      
425,801
      
(637,916
 )    
52,604,426
  
Other securities
    
4,046,332
      
703,978
      
(27,331
 )    
4,722,979
  
    $
253,609,401
     $
1,437,658
     $
(3,933,920
 )   $
251,113,139
  
Schedule of Unrealized Loss on Investments [Table Text Block]
   
Less than 12 Months
    
12 Months or More
    
Total
  
           
Gross
            
Gross
            
Gross
  
   
Fair
    
Unrealized
    
Fair
    
Unrealized
    
Fair
    
Unrealized
  
   
Value
    
Losses
    
Value
    
Losses
    
Value
    
Losses
  
June 30, 2017:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Securities HTM:
                                                
Municipal securities
   $
64,001,034
     $
(1,792,524
 )   $
30,641,106
     $
(1,449,702
 )   $
94,642,140
     $
(3,242,226
 )
                                                 
Securities AFS:
                                                
U.S. govt. sponsored agency securities
   $
27,793,290
     $
(184,702
 )   $
4,775,235
     $
(4,645
 )   $
32,568,525
     $
(189,347
 )
Residential mortgage-backed and related securities
    
129,347,074
      
(1,614,041
 )    
8,839,471
      
(280,650
 )    
138,186,545
      
(1,894,691
 )
Municipal securities
    
25,578,044
      
(234,044
 )    
336,441
      
(18,497
 )    
25,914,485
      
(252,541
 )
Other securities
    
926,800
      
(22,550
 )    
-
      
-
      
926,800
      
(22,550
 )
    $
183,645,208
     $
(2,055,337
 )   $
13,951,147
     $
(303,792
 )   $
197,596,355
     $
(2,359,129
 )
                                                 
December 31, 2016:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Securities HTM:
                                                
Municipal securities
   $
122,271,533
     $
(4,076,647
 )   $
13,010,803
     $
(618,087
 )   $
135,282,336
     $
(4,694,734
 )
                                                 
Securities AFS:
                                                
U.S. govt. sponsored agency securities
   $
21,788,139
     $
(257,640
 )   $
5,499,012
     $
(72,945
 )   $
27,287,151
     $
(330,585
 )
Residential mortgage-backed and related securities
    
121,506,582
      
(2,641,664
 )    
7,437,615
      
(296,424
 )    
128,944,197
      
(2,938,088
 )
Municipal securities
    
34,152,822
      
(618,462
 )    
338,099
      
(19,454
 )    
34,490,921
      
(637,916
 )
Other securities
    
3,177,414
      
(27,331
 )    
-
      
-
      
3,177,414
      
(27,331
 )
    $
180,624,957
     $
(3,545,097
 )   $
13,274,726
     $
(388,823
 )   $
193,899,683
     $
(3,933,920
 )
Realized Gain (Loss) on Investments [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
   
June 30, 2017
    
June 30, 2016
    
June 30, 2017
    
June 30, 2016
  
                                 
Proceeds from sales of securities
   $
13,554,075
     $
5,548,294
     $
13,554,075
     $
61,075,145
  
Pre-tax gross gains from sales of securities
    
59,568
      
18,030
      
59,568
      
533,545
  
Pre-tax gross losses from sales of securities
    
(21,104
 )    
-
      
(21,104
 )    
(157,035
 )
Investments Classified by Contractual Maturity Date [Table Text Block]
   
Amortized Cost
    
Fair Value
  
Securities HTM:
                
Due in one year or less
   $
7,479,990
     $
7,478,528
  
Due after one year through five years
    
18,040,753
      
18,137,483
  
Due after five years
    
298,682,891
      
297,373,366
  
    $
324,203,634
     $
322,989,377
  
                 
Securities AFS:
                
Due in one year or less
   $
3,498,188
     $
3,504,089
  
Due after one year through five years
    
31,550,278
      
31,700,139
  
Due after five years
    
64,870,032
      
64,840,746
  
    $
99,918,498
     $
100,044,974
  
Residential mortgage-backed and related securities
    
166,063,973
      
164,414,833
  
Other securities
    
4,065,468
      
4,821,906
  
    $
270,047,939
     $
269,281,713
  
   
Amortized Cost
    
Fair Value
  
Securities HTM:
                
Municipal securities
   $
170,556,294
     $
170,715,228
  
                 
Securities AFS:
                
U.S. govt. sponsored agency securities
    
5,048,597
      
5,040,134
  
Municipal securities
    
41,135,349
      
41,095,251
  
    $
46,183,946
     $
46,135,385
  
Schedule of Investment in Bond Securities [Table Text Block]
June 30, 2017:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. State:
  
Number of
Issuers
   
Amortized Cost
   
Fair Value
   
Average
Exposure Per
Issuer
(Fair Value)
 
                                 
Iowa
    
26
     $
31,131,484
     $
31,242,925
     $
1,201,651
  
North Dakota
    
7
      
21,619,812
      
21,514,855
      
3,073,551
  
Illinois
    
19
      
14,872,773
      
15,051,806
      
792,200
  
Missouri
    
16
      
9,078,540
      
9,123,733
      
570,233
  
Ohio
    
10
      
8,716,542
      
8,588,019
      
858,802
  
Texas
    
8
      
5,347,075
      
5,336,188
      
667,024
  
Other
    
38
      
16,886,554
      
16,997,159
      
447,294
  
Total general obligation bonds
    
124
     $
107,652,780
     $
107,854,685
     $
869,796
  
December 31, 2016:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. State:
  
Number of
Issuers
   
Amortized Cost
   
Fair Value
   
Average
Exposure Per
Issuer
(Fair Value)
 
                                 
Iowa
    
27
     $
32,258,612
     $
32,231,936
     $
1,193,775
  
Illinois
    
19
      
29,214,559
      
29,308,438
      
1,542,549
  
North Dakota
    
7
      
22,169,050
      
21,499,075
      
3,071,296
  
Missouri
    
14
      
8,291,192
      
8,323,245
      
594,518
  
Ohio
    
8
      
6,790,398
      
6,651,897
      
831,487
  
Other
    
41
      
18,481,496
      
18,458,044
      
450,196
  
Total general obligation bonds
    
116
     $
117,205,307
     $
116,472,635
     $
1,004,074
  
June 30, 2017:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. State:
  
Number of
Issuers
   
Amortized Cost
   
Fair Value
   
Average
Exposure
Per
Issuer
(Fair Value)
 
                                 
Missouri
    
54
     $
107,360,504
     $
106,983,845
     $
1,981,182
  
Iowa
    
27
      
57,862,675
      
57,834,419
      
2,142,016
  
Indiana
    
21
      
50,114,290
      
49,578,767
      
2,360,894
  
Ohio
    
5
      
19,691,358
      
19,493,348
      
3,898,670
  
Kansas
    
6
      
13,178,963
      
13,179,104
      
2,196,517
  
North Dakota
    
5
      
11,729,782
      
11,676,766
      
2,335,353
  
Other
    
8
      
13,444,620
      
13,438,953
      
1,679,869
  
Total revenue bonds
    
126
     $
273,382,192
     $
272,185,202
     $
2,160,200
  
December 31, 2016:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. State:
  
Number of
Issuers
   
Amortized Cost
   
Fair Value
   
Average
Exposure Per
Issuer
(Fair Value)
 
                                 
Missouri
    
47
     $
90,784,441
     $
89,664,013
     $
1,907,745
  
Iowa
    
31
      
70,788,393
      
71,142,393
      
2,294,916
  
Indiana
    
22
      
47,994,737
      
47,582,138
      
2,162,824
  
Kansas
    
6
      
13,476,366
      
13,427,491
      
2,237,915
  
North Dakota
    
4
      
8,089,067
      
7,796,381
      
1,949,095
  
Ohio
    
3
      
13,650,000
      
13,405,222
      
4,468,407
  
Other
    
7
      
12,687,286
      
12,479,052
      
1,782,722
  
Total revenue bonds
    
120
     $
257,470,290
     $
255,496,690
     $
2,129,139