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Note 3 - Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Unrealized Gain (Loss) on Investments [Table Text Block]
           
Gross
    
Gross
          
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
(Losses)
    
Value
  
December 31, 2016:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Securities held to maturity:
                                
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 available for sale:
                                
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
 
                                 
December 31, 2015:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Securities held to maturity:
                                
Municipal securities
   $
252,624,159
    $
3,190,558
    $
(1,173,432
 )   $
254,641,285
 
Other securities
    
1,050,000
     
-
     
-
     
1,050,000
 
    $
253,674,159
    $
3,190,558
    $
(1,173,432
 )   $
255,691,285
 
                                 
Securities available for sale:
                                
U.S. govt. sponsored agency securities
   $
216,281,416
    $
104,524
    $
(2,848,561
 )   $
213,537,379
 
Residential mortgage-backed and related securities
    
81,442,479
     
511,095
     
(1,283,439
 )    
80,670,135
 
Municipal securities
    
26,764,981
     
872,985
     
(59,378
 )    
27,578,588
 
Other securities
    
1,108,124
     
540,919
     
(163
 )    
1,648,880
 
    $
325,597,000
    $
2,029,523
    $
(4,191,541
 )   $
323,434,982
 
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
  
December 31, 2016:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Securities held to maturity:
                                                
Municipal securities
   $
122,271,533
    $
(4,076,647
 )   $
13,010,803
    $
(618,087
 )   $
135,282,336
    $
(4,694,734
 )
                                                 
Securities available for sale:
                                                
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
 )
                                                 
December 31, 2015:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Securities held to maturity:
                                                
Municipal securities
   $
14,803,408
    $
(294,438
 )   $
19,927,581
    $
(878,994
 )   $
34,730,989
    $
(1,173,432
 )
                                                 
Securities available for sale:
                                                
U.S. govt. sponsored agency securities
   $
112,900,327
    $
(1,397,591
 )   $
64,476,661
    $
(1,450,970
 )   $
177,376,988
    $
(2,848,561
 )
Residential mortgage-backed and related securities
    
40,356,921
     
(730,466
 )    
19,836,637
     
(552,973
 )    
60,193,558
     
(1,283,439
 )
Municipal securities
    
2,220,800
     
(31,807
 )    
848,329
     
(27,571
 )    
3,069,129
     
(59,378
 )
Other securities
    
411
     
(163
 )    
-
     
-
     
411
     
(163
 )
    $
155,478,459
    $
(2,160,027
 )   $
85,161,627
    $
(2,031,514
 )   $
240,640,086
    $
(4,191,541
 )
Realized Gain (Loss) on Investments [Table Text Block]
   
2016
    
2015
    
2014
  
                         
Proceeds from sales of securities
   $
134,188,737
    $
81,410,368
    $
78,476,422
 
Gross gains from sales of securities
    
4,845,009
     
1,045,444
     
517,116
 
Gross losses from sales of securities
    
(252,611
 )    
(246,461
 )    
(424,753
 )
Investments Classified by Contractual Maturity Date [Table Text Block]
   
Amortized Cost
    
Fair Value
  
Securities held to maturity:
                
Due in one year or less
   $
23,795,317
    $
23,816,249
 
Due after one year through five years
    
16,362,018
     
16,406,132
 
Due after five years
    
282,751,721
     
280,192,518
 
    $
322,909,056
    $
320,414,899
 
                 
Securities available for sale:
                
Due in one year or less
   $
3,103,329
    $
3,102,013
 
Due after one year through five years
    
44,550,460
     
44,614,611
 
Due after five years
    
51,444,058
     
50,971,409
 
    $
99,097,847
    $
98,688,033
 
Residential mortgage-backed and related securities
    
150,465,222
     
147,702,127
 
Other securities
    
4,046,332
     
4,722,979
 
    $
253,609,401
    $
251,113,139
 
   
Amortized Cost
    
Fair Value
  
Securities held to maturity:
                
Municipal securities
   $
179,399,031
    $
176,447,494
 
                 
Securities available for sale:
                
U.S. govt. sponsored agency securities
    
5,058,440
     
5,083,493
 
Municipal securities
    
40,032,698
     
39,633,259
 
    $
45,091,138
    $
44,716,752
 
Schedule of Investment in Bond Securities [Table Text Block]
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
 
December 31, 2015:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. State:
  
Number of
Issuers
   
Amortized Cost
   
Fair Value
   
Average
Exposure Per
Issuer
(Fair Value)
 
                                 
Iowa
    
15
     $
19,974,939
    $
20,247,108
    $
1,349,807
 
Illinois
    
9
      
10,928,700
     
11,264,348
     
1,251,594
 
North Dakota
    
5
      
10,890,000
     
11,050,235
     
2,210,047
 
Missouri
    
12
      
7,924,800
     
7,986,856
     
665,571
 
Other
    
41
      
16,965,393
     
17,229,485
     
420,231
 
Total general obligation bonds
    
82
     $
66,683,832
    $
67,778,032
    $
826,561
 
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
 
December 31, 2015:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. State:
  
Number of
Issuers
   
Amortized Cost
   
Fair Value
   
Average
Exposure
Per
Issuer
(Fair Value)
 
                                 
Missouri
    
41
     $
78,593,590
    $
79,015,378
    $
1,927,204
 
Iowa
    
26
      
70,773,660
     
71,659,410
     
2,756,131
 
Indiana
    
17
      
40,018,381
     
40,210,320
     
2,365,313
 
Kansas
    
3
      
11,748,679
     
11,821,055
     
3,940,352
 
Other
    
5
      
11,570,998
     
11,735,678
     
2,347,136
 
Total revenue bonds
    
92
     $
212,705,308
    $
214,441,841
    $
2,330,890