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Note 2 - Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Unrealized Gain (Loss) on Investments [Table Text Block]
           
Gross
    
Gross
          
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
(Losses)
    
Value
  
March 31, 2017:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Securities HTM:
                                
Municipal securities
   $
305,644,063
     $
2,193,278
     $
(4,690,335
 )   $
303,147,006
  
Other securities
    
1,050,000
      
-
      
-
      
1,050,000
  
    $
306,694,063
     $
2,193,278
     $
(4,690,335
 )   $
304,197,006
  
                                 
Securities AFS:
                                
U.S. govt. sponsored agency securities
   $
47,720,622
     $
130,306
     $
(294,847
 )   $
47,556,081
  
Residential mortgage-backed and related securities
    
149,968,905
      
160,174
      
(2,625,092
 )    
147,503,987
  
Municipal securities
    
51,104,318
      
454,505
      
(426,949
 )    
51,131,874
  
Other securities
    
4,056,248
      
760,936
      
(57,105
 )    
4,760,079
  
    $
252,850,093
     $
1,505,921
     $
(3,403,993
 )   $
250,952,021
  
                                 
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
  
March 31, 2017:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Securities HTM:
                                                
Municipal securities
   $
110,858,743
     $
(3,751,123
 )   $
15,350,772
     $
(939,212
 )   $
126,209,515
     $
(4,690,335
 )
                                                 
Securities AFS:
                                                
U.S. govt. sponsored agency securities
   $
18,742,054
     $
(230,974
 )   $
5,115,200
     $
(63,873
 )   $
23,857,254
     $
(294,847
 )
Residential mortgage-backed and related securities
    
124,401,508
      
(2,266,050
 )    
9,181,284
      
(359,042
 )    
133,582,792
      
(2,625,092
 )
Municipal securities
    
29,386,855
      
(408,233
 )    
337,522
      
(18,716
 )    
29,724,377
      
(426,949
 )
Other securities
    
2,901,563
      
(57,105
 )    
-
      
-
      
2,901,563
      
(57,105
 )
    $
175,431,980
     $
(2,962,362
 )   $
14,634,006
     $
(441,631
 )   $
190,065,986
     $
(3,403,993
 )
                                                 
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
  
   
March 31, 2016
  
         
Proceeds from sales of securities
   $
55,526,851
  
Pre-tax gross gains from sales of securities
    
515,515
  
Pre-tax gross losses from sales of securities
    
(157,035
 )
Investments Classified by Contractual Maturity Date [Table Text Block]
   
Amortized Cost
    
Fair Value
  
Securities HTM:
                
Due in one year or less
   $
8,580,563
     $
8,580,930
  
Due after one year through five years
    
16,946,533
      
17,027,273
  
Due after five years
    
281,166,967
      
278,588,803
  
    $
306,694,063
     $
304,197,006
  
                 
Securities AFS:
                
Due in one year or less
   $
3,228,439
     $
3,240,004
  
Due after one year through five years
    
43,980,525
      
44,165,961
  
Due after five years
    
51,615,976
      
51,281,990
  
    $
98,824,940
     $
98,687,955
  
Residential mortgage-backed and related securities
    
149,968,905
      
147,503,987
  
Other securities
    
4,056,248
      
4,760,079
  
    $
252,850,093
     $
250,952,021
  
   
Amortized Cost
    
Fair Value
  
Securities HTM:
                
Municipal securities
   $
163,299,673
     $
161,458,045
  
                 
Securities AFS:
                
U.S. govt. sponsored agency securities
    
5,048,496
      
5,059,493
  
Municipal securities
    
39,611,651
      
39,404,492
  
    $
44,660,147
     $
44,463,985
  
Schedule of Investment in Bond Securities [Table Text Block]
March 31, 2017:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. State:
  
Number of
Issuers
    
Amortized Cost
    
Fair Value
    
Average
Exposure
Per Issuer
(Fair Value)
  
                                 
Iowa
    
27
     $
32,227,250
     $
32,252,723
     $
1,194,545
  
North Dakota
    
7
      
22,169,480
      
21,572,627
      
3,081,804
  
Illinois
    
17
      
12,915,605
      
13,060,349
      
768,256
  
Missouri
    
15
      
8,060,239
      
8,097,352
      
539,823
  
Ohio
    
8
      
6,785,433
      
6,635,402
      
829,425
  
Other
    
38
      
17,657,322
      
17,700,070
      
465,791
  
Total general obligation bonds
    
112
     $
99,815,329
     $
99,318,523
     $
886,773
  
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
  
March 31, 2017:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. State:
  
Number of
Issuers
    
Amortized Cost
    
Fair Value
    
Average
Exposure
Per Issuer
(Fair Value)
  
                                 
Missouri
    
50
     $
92,894,184
     $
91,892,614
     $
1,837,852
  
Iowa
    
31
      
70,400,232
      
70,771,347
      
2,282,947
  
Indiana
    
22
      
46,469,290
      
45,838,852
      
2,083,584
  
Ohio
    
3
      
13,650,000
      
13,380,921
      
4,460,307
  
Kansas
    
6
      
13,260,612
      
13,243,053
      
2,207,176
  
North Dakota
    
4
      
7,992,074
      
7,722,774
      
1,930,694
  
Other
    
7
      
12,266,660
      
12,110,796
      
1,730,114
  
Total revenue bonds
    
123
     $
256,933,052
     $
254,960,357
     $
2,072,848
  
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