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Note 2 - Investment Securities - Amortized Cost and Fair Values of General Obligation Bonds and Revenue Bonds by Issuer's State (Details) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
--- | --- | ---
General Obligation Bonds [Member] |  |
Fair value | $ 107,854,685 | $ 116,472,635
Average exposure per issuer (fair value) | $ 869,796 | $ 1,004,074
Number of issuers | 124 | 116
Amortized cost | $ 107,652,780 | $ 117,205,307
General Obligation Bonds [Member] | Iowa [Member] |  |
Fair value | 31,242,925 | 32,231,936
Average exposure per issuer (fair value) | $ 1,201,651 | $ 1,193,775
Number of issuers | 26 | 27
Amortized cost | $ 31,131,484 | $ 32,258,612
General Obligation Bonds [Member] | Missouri [Member] |  |
Fair value | 9,123,733 | 8,323,245
Average exposure per issuer (fair value) | $ 570,233 | $ 594,518
Number of issuers | 16 | 14
Amortized cost | $ 9,078,540 | $ 8,291,192
General Obligation Bonds [Member] | North Dakota [Member] |  |
Fair value | 21,514,855 | 21,499,075
Average exposure per issuer (fair value) | $ 3,073,551 | $ 3,071,296
Number of issuers | 7 | 7
Amortized cost | $ 21,619,812 | $ 22,169,050
General Obligation Bonds [Member] | Illinois [Member] |  |
Fair value | 15,051,806 | 29,308,438
Average exposure per issuer (fair value) | $ 792,200 | $ 1,542,549
Number of issuers | 19 | 19
Amortized cost | $ 14,872,773 | $ 29,214,559
General Obligation Bonds [Member] | Ohio [Member] |  |
Fair value | 8,588,019 | 6,651,897
Average exposure per issuer (fair value) | $ 858,802 | $ 831,487
Number of issuers | 10 | 8
Amortized cost | $ 8,716,542 | $ 6,790,398
General Obligation Bonds [Member] | Texas [Member] |  |
Fair value | 5,336,188 |
Average exposure per issuer (fair value) | $ 667,024 |
Number of issuers | 8 |
Amortized cost | $ 5,347,075 |
General Obligation Bonds [Member] | Other States [Member] |  |
Fair value | 16,997,159 | 18,458,044
Average exposure per issuer (fair value) | $ 447,294 | $ 450,196
Number of issuers | 38 | 41
Amortized cost | $ 16,886,554 | $ 18,481,496
Revenue Bonds [Member] |  |
Fair value | 272,185,202 | 255,496,690
Average exposure per issuer (fair value) | $ 2,160,200 | $ 2,129,139
Number of issuers | 126 | 120
Amortized cost | $ 273,382,192 | $ 257,470,290
Revenue Bonds [Member] | Iowa [Member] |  |
Fair value | 57,834,419 | 71,142,393
Average exposure per issuer (fair value) | $ 2,142,016 | $ 2,294,916
Number of issuers | 27 | 31
Amortized cost | $ 57,862,675 | $ 70,788,393
Revenue Bonds [Member] | Missouri [Member] |  |
Fair value | 106,983,845 | 89,664,013
Average exposure per issuer (fair value) | $ 1,981,182 | $ 1,907,745
Number of issuers | 54 | 47
Amortized cost | $ 107,360,504 | $ 90,784,441
Revenue Bonds [Member] | North Dakota [Member] |  |
Fair value | 11,676,766 | 7,796,381
Average exposure per issuer (fair value) | $ 2,335,353 | $ 1,949,095
Number of issuers | 5 | 4
Amortized cost | $ 11,729,782 | $ 8,089,067
Revenue Bonds [Member] | Indiana [Member] |  |
Fair value | 49,578,767 | 47,582,138
Average exposure per issuer (fair value) | $ 2,360,894 | $ 2,162,824
Number of issuers | 21 | 22
Amortized cost | $ 50,114,290 | $ 47,994,737
Revenue Bonds [Member] | Ohio [Member] |  |
Fair value | 19,493,348 | 13,405,222
Average exposure per issuer (fair value) | $ 3,898,670 | $ 4,468,407
Number of issuers | 5 | 3
Amortized cost | $ 19,691,358 | $ 13,650,000
Revenue Bonds [Member] | Kansas [Member] |  |
Fair value | 13,179,104 | 13,427,491
Average exposure per issuer (fair value) | $ 2,196,517 | $ 2,237,915
Number of issuers | 6 | 6
Amortized cost | $ 13,178,963 | $ 13,476,366
Revenue Bonds [Member] | Other States [Member] |  |
Fair value | 13,438,953 | 12,479,052
Average exposure per issuer (fair value) | $ 1,679,869 | $ 1,782,722
Number of issuers | 8 | 7
Amortized cost | $ 13,444,620 | $ 12,687,286

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