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Note 2 - Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Unrealized Gain (Loss) on Investments [Table Text Block]
           
Gross
    
Gross
          
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
(Losses)
    
Value
  
September 30, 2017:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Securities HTM:
                                
Municipal securities
   $
322,931,227
     $
2,084,997
     $
(2,629,646
 )   $
322,386,578
  
Other securities
    
1,050,000
      
-
      
-
      
1,050,000
  
    $
323,981,227
     $
2,084,997
     $
(2,629,646
 )   $
323,436,578
  
                                 
Securities AFS:
                                
U.S. govt. sponsored agency securities
   $
39,340,306
     $
129,768
     $
(129,906
 )   $
39,340,168
  
Residential mortgage-backed and related securities
    
160,329,128
      
266,806
      
(1,627,425
 )    
158,968,509
  
Municipal securities
    
56,621,412
      
435,356
      
(293,708
 )    
56,763,060
  
Other securities
    
4,077,128
      
826,135
      
(20,578
 )    
4,882,685
  
    $
260,367,974
     $
1,658,065
     $
(2,071,617
 )   $
259,954,422
  
                                 
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
  
September 30, 2017:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Securities HTM:
                                                
Municipal securities
   $
17,779,999
     $
(254,147
 )   $
68,663,362
     $
(2,375,499
 )   $
86,443,361
     $
(2,629,646
 )
                                                 
Securities AFS:
                                                
U.S. govt. sponsored agency securities
   $
23,607,646
     $
(129,906
 )   $
-
     $
-
     $
23,607,646
     $
(129,906
 )
Residential mortgage-backed and related securities
    
111,996,030
      
(1,255,971
 )    
12,648,688
      
(371,454
 )    
124,644,718
      
(1,627,425
 )
Municipal securities
    
18,776,501
      
(169,253
 )    
12,872,616
      
(124,455
 )    
31,649,117
      
(293,708
 )
Other securities
    
928,772
      
(20,578
 )    
-
      
-
      
928,772
      
(20,578
 )
    $
155,308,949
     $
(1,575,708
 )   $
25,521,304
     $
(495,909
 )   $
180,830,253
     $
(2,071,617
 )
                                                 
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
    
Nine Months Ended
  
   
September 30, 2017
    
September 30, 2016
    
September 30, 2017
    
September 30, 2016
  
                                 
Proceeds from sales of securities*
   $
8,415,795
     $
58,775,764
     $
21,969,870
     $
119,850,909
  
Pre-tax gross gains from sales of securities
    
6,312
      
4,281,828
      
65,880
      
4,815,373
  
Pre-tax gross losses from sales of securities
    
(69,900
 )    
(30,055
 )    
(91,004
 )    
(187,090
 )
Investments Classified by Contractual Maturity Date [Table Text Block]
   
Amortized Cost
    
Fair Value
  
Securities HTM:
                
Due in one year or less
   $
2,940,492
     $
2,940,378
  
Due after one year through five years
    
18,268,264
      
18,374,059
  
Due after five years
    
302,772,471
      
302,122,141
  
    $
323,981,227
     $
323,436,578
  
                 
Securities AFS:
                
Due in one year or less
   $
3,135,008
     $
3,143,223
  
Due after one year through five years
    
26,545,903
      
26,712,930
  
Due after five years
    
66,280,807
      
66,247,075
  
     
95,961,718
      
96,103,228
  
Residential mortgage-backed and related securities
    
160,329,128
      
158,968,509
  
Other securities
    
4,077,128
      
4,882,685
  
    $
260,367,974
     $
259,954,422
  
   
Amortized Cost
    
Fair Value
  
Securities HTM:
                
Municipal securities
   $
170,900,193
     $
171,633,005
  
                 
Securities AFS:
                
U.S. govt. sponsored agency securities
    
5,048,652
      
5,033,292
  
Municipal securities
    
45,727,004
      
45,640,630
  
    $
50,775,656
     $
50,673,922
  
Schedule of Investment in Bond Securities [Table Text Block]
September 30, 2017:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. State:
  
Number of
Issuers
   
Amortized Cost
   
Fair Value
   
Average
Exposure Per
Issuer

(Fair Value)
 
                                 
North Dakota
    
7
     $
21,625,068
     $
21,593,895
     $
3,084,842
  
Illinois
    
21
      
18,319,644
      
18,501,854
      
881,041
  
Iowa
    
21
      
17,990,978
      
17,993,895
      
856,852
  
Missouri
    
16
      
8,956,396
      
8,983,511
      
561,469
  
Ohio
    
9
      
8,289,069
      
8,180,432
      
908,937
  
Texas
    
10
      
6,609,101
      
6,543,660
      
654,366
  
Other
    
35
      
18,520,725
      
18,626,763
      
532,193
  
Total general obligation bonds
    
119
     $
100,310,981
     $
100,424,010
     $
843,899
  
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
  
September 30, 2017:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. State:
  
Number of
Issuers
   
Amortized Cost
   
Fair Value
   
Average
Exposure
Per Issuer
(Fair Value)
 
                                 
Missouri
    
55
     $
107,274,712
     $
107,108,520
     $
1,947,428
  
Iowa
    
28
      
62,468,124
      
62,615,875
      
2,236,281
  
Indiana
    
23
      
50,080,705
      
49,560,095
      
2,154,787
  
Ohio
    
5
      
19,674,376
      
19,523,478
      
3,904,696
  
Kansas
    
6
      
12,877,308
      
12,879,871
      
2,146,645
  
North Dakota
    
5
      
11,496,420
      
11,471,544
      
2,294,309
  
Other
    
10
      
15,370,013
      
15,566,245
      
1,556,625
  
Total revenue bonds
    
132
     $
279,241,658
     $
278,725,628
     $
2,111,558
  
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