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Note 3 - Investment Securities - General Obligation and Revenue Bonds (Details) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
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General Obligation Bonds [Member] |  |
Number of issuers | 131 | 116
Amortized cost | $ 107,337,076 | $ 117,205,307
Other Investments | 107,978,015 | 116,472,635
Average exposure per issuer (fair value) | 824,260 | 1,004,074
Fair value | $ 107,978,015 | $ 116,472,635
General Obligation Bonds [Member] | Illinois [Member] |  |
Number of issuers | 20 | 19
Amortized cost | $ 19,328,700 | $ 29,214,559
Other Investments | 19,514,024 | 29,308,438
Average exposure per issuer (fair value) | 975,701 | 1,542,549
Fair value | $ 19,514,024 | $ 29,308,438
General Obligation Bonds [Member] | Iowa [Member] |  |
Number of issuers | 16 | 27
Amortized cost | $ 13,881,689 | $ 32,258,612
Other Investments | 13,969,512 | 32,231,936
Average exposure per issuer (fair value) | 873,095 | 1,193,775
Fair value | $ 13,969,512 | $ 32,231,936
General Obligation Bonds [Member] | Missouri [Member] |  |
Number of issuers | 17 | 14
Amortized cost | $ 9,243,355 | $ 8,291,192
Other Investments | 9,308,287 | 8,323,245
Average exposure per issuer (fair value) | 547,546 | 594,518
Fair value | $ 9,308,287 | $ 8,323,245
General Obligation Bonds [Member] | North Dakota [Member] |  |
Number of issuers | 7 | 7
Amortized cost | $ 21,626,574 | $ 22,169,050
Other Investments | 21,724,197 | 21,499,075
Average exposure per issuer (fair value) | 3,103,457 | 3,071,296
Fair value | $ 21,724,197 | $ 21,499,075
General Obligation Bonds [Member] | Ohio [Member] |  |
Number of issuers | 9 | 8
Amortized cost | $ 8,002,705 | $ 6,790,398
Other Investments | 7,938,028 | 6,651,897
Average exposure per issuer (fair value) | 882,003 | 831,487
Fair value | $ 7,938,028 | $ 6,651,897
General Obligation Bonds [Member] | Texas [Member] |  |
Number of issuers | 17 |
Amortized cost | $ 11,253,775 |
Other Investments | 11,308,848 |
Average exposure per issuer (fair value) | 665,226 |
Fair value | $ 11,308,848 |
General Obligation Bonds [Member] | Other States [Member] |  |
Number of issuers | 45 | 41
Amortized cost | $ 24,000,278 | $ 18,481,496
Other Investments | 24,215,119 | 18,458,044
Average exposure per issuer (fair value) | 538,114 | 450,196
Fair value | $ 24,215,119 | $ 18,458,044
Revenue Bonds [Member] |  |
Number of issuers | 145 | 120
Amortized cost | $ 337,263,493 | $ 257,470,290
Other Investments | 337,347,285 | 255,496,690
Average exposure per issuer (fair value) | 2,326,533 | 2,129,139
Fair value | $ 337,347,285 | $ 255,496,690
Revenue Bonds [Member] | Illinois [Member] |  |
Number of issuers | 2 |
Amortized cost | $ 17,211,441 |
Other Investments | 17,408,544 |
Average exposure per issuer (fair value) | 8,704,272 |
Fair value | $ 17,408,544 |
Revenue Bonds [Member] | Indiana [Member] |  |
Number of issuers | 26 | 22
Amortized cost | $ 51,171,818 | $ 47,994,737
Other Investments | 50,861,336 | 47,582,138
Average exposure per issuer (fair value) | 1,956,205 | 2,162,824
Fair value | $ 50,861,336 | $ 47,582,138
Revenue Bonds [Member] | Iowa [Member] |  |
Number of issuers | 29 | 31
Amortized cost | $ 68,724,899 | $ 70,788,393
Other Investments | 69,079,470 | 71,142,393
Average exposure per issuer (fair value) | 2,382,051 | 2,294,916
Fair value | $ 69,079,470 | $ 71,142,393
Revenue Bonds [Member] | Missouri [Member] |  |
Number of issuers | 56 | 47
Amortized cost | $ 106,259,015 | $ 90,784,441
Other Investments | 106,232,837 | 89,664,013
Average exposure per issuer (fair value) | 1,897,015 | 1,907,745
Fair value | $ 106,232,837 | $ 89,664,013
Revenue Bonds [Member] | Kansas [Member] |  |
Number of issuers | 6 | 6
Amortized cost | $ 12,873,329 | $ 13,476,366
Other Investments | 12,877,087 | 13,427,491
Average exposure per issuer (fair value) | 2,146,181 | 2,237,915
Fair value | $ 12,877,087 | $ 13,427,491
Revenue Bonds [Member] | North Dakota [Member] |  |
Number of issuers | 5 | 4
Amortized cost | $ 11,451,560 | $ 8,089,067
Other Investments | 11,351,676 | 7,796,381
Average exposure per issuer (fair value) | 2,270,335 | 1,949,095
Fair value | $ 11,351,676 | $ 7,796,381
Revenue Bonds [Member] | Ohio [Member] |  |
Number of issuers | 10 | 3
Amortized cost | $ 55,766,091 | $ 13,650,000
Other Investments | 55,820,203 | 13,405,222
Average exposure per issuer (fair value) | 5,582,020 | 4,468,407
Fair value | $ 55,820,203 | $ 13,405,222
Revenue Bonds [Member] | Other States [Member] |  |
Number of issuers | 11 | 7
Amortized cost | $ 13,805,340 | $ 12,687,286
Other Investments | 13,716,132 | 12,479,052
Average exposure per issuer (fair value) | 1,246,921 | 1,782,722
Fair value | $ 13,716,132 | $ 12,479,052

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