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Note 2 - Investment Securities - General Obligation and Revenue Bonds (Details) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | ---
General Obligation Bonds [Member] |  |
Number of issuers | 128 | 131
Amortized cost | $ 102,757,219 | $ 107,337,076
Other Investments, Total | 101,343,490 | 107,978,015
Average exposure per issuer (fair value) | 791,746 | 824,260
Fair value | $ 101,343,490 | $ 107,978,015
General Obligation Bonds [Member] | North Dakota [Member] |  |
Number of issuers | 7 | 7
Amortized cost | $ 21,627,097 | $ 21,626,574
Other Investments, Total | 20,756,566 | 21,724,197
Average exposure per issuer (fair value) | 2,965,224 | 3,103,457
Fair value | $ 20,756,566 | $ 21,724,197
General Obligation Bonds [Member] | Missouri [Member] |  |
Number of issuers | 17 | 17
Amortized cost | $ 8,314,872 | $ 9,243,355
Other Investments, Total | 8,323,476 | 9,308,287
Average exposure per issuer (fair value) | 489,616 | 547,546
Fair value | $ 8,323,476 | $ 9,308,287
General Obligation Bonds [Member] | Illinois [Member] |  |
Number of issuers | 20 | 20
Amortized cost | $ 18,532,776 | $ 19,328,700
Other Investments, Total | 18,513,766 | 19,514,024
Average exposure per issuer (fair value) | 925,688 | 975,701
Fair value | $ 18,513,766 | $ 19,514,024
General Obligation Bonds [Member] | Iowa [Member] |  |
Number of issuers | 16 | 16
Amortized cost | $ 13,878,991 | $ 13,881,689
Other Investments, Total | 13,830,003 | 13,969,512
Average exposure per issuer (fair value) | 864,375 | 873,095
Fair value | $ 13,830,003 | $ 13,969,512
General Obligation Bonds [Member] | Ohio [Member] |  |
Number of issuers | 8 | 9
Amortized cost | $ 7,378,887 | $ 8,002,705
Other Investments, Total | 7,296,859 | 7,938,028
Average exposure per issuer (fair value) | 912,107 | 882,003
Fair value | $ 7,296,859 | $ 7,938,028
General Obligation Bonds [Member] | Texas [Member] |  |
Number of issuers | 17 | 17
Amortized cost | $ 10,763,333 | $ 11,253,775
Other Investments, Total | 10,554,430 | 11,308,848
Average exposure per issuer (fair value) | 620,849 | 665,226
Fair value | $ 10,554,430 | $ 11,308,848
General Obligation Bonds [Member] | Other States [Member] |  |
Number of issuers | 43 | 45
Amortized cost | $ 22,261,263 | $ 24,000,278
Other Investments, Total | 22,068,390 | 24,215,119
Average exposure per issuer (fair value) | 513,218 | 538,114
Fair value | $ 22,068,390 | $ 24,215,119
Revenue Bonds [Member] |  |
Number of issuers | 148 | 145
Amortized cost | $ 336,639,783 | $ 337,263,493
Other Investments, Total | 334,612,172 | 337,347,285
Average exposure per issuer (fair value) | 2,260,893 | 2,326,533
Fair value | $ 334,612,172 | $ 337,347,285
Revenue Bonds [Member] | North Dakota [Member] |  |
Number of issuers | 5 | 5
Amortized cost | $ 11,220,278 | $ 11,451,560
Other Investments, Total | 10,644,441 | 11,351,676
Average exposure per issuer (fair value) | 2,128,888 | 2,270,335
Fair value | $ 10,644,441 | $ 11,351,676
Revenue Bonds [Member] | Missouri [Member] |  |
Number of issuers | 58 | 56
Amortized cost | $ 108,311,804 | $ 106,259,015
Other Investments, Total | 108,445,780 | 106,232,837
Average exposure per issuer (fair value) | 1,869,755 | 1,897,015
Fair value | $ 108,445,780 | $ 106,232,837
Revenue Bonds [Member] | Illinois [Member] |  |
Number of issuers | 2 | 2
Amortized cost | $ 17,205,951 | $ 17,211,441
Other Investments, Total | 17,373,994 | 17,408,544
Average exposure per issuer (fair value) | 8,686,997 | 8,704,272
Fair value | $ 17,373,994 | $ 17,408,544
Revenue Bonds [Member] | Iowa [Member] |  |
Number of issuers | 29 | 29
Amortized cost | $ 68,370,374 | $ 68,724,899
Other Investments, Total | 68,236,038 | 69,079,470
Average exposure per issuer (fair value) | 2,352,967 | 2,382,051
Fair value | $ 68,236,038 | $ 69,079,470
Revenue Bonds [Member] | Ohio [Member] |  |
Number of issuers | 10 | 10
Amortized cost | $ 55,757,914 | $ 55,766,091
Other Investments, Total | 55,699,375 | 55,820,203
Average exposure per issuer (fair value) | 5,569,938 | 5,582,020
Fair value | $ 55,699,375 | $ 55,820,203
Revenue Bonds [Member] | Indiana [Member] |  |
Number of issuers | 26 | 26
Amortized cost | $ 49,258,364 | $ 51,171,818
Other Investments, Total | 48,833,113 | 50,861,336
Average exposure per issuer (fair value) | 1,878,197 | 1,956,205
Fair value | $ 48,833,113 | $ 50,861,336
Revenue Bonds [Member] | Kansas [Member] |  |
Number of issuers | 6 | 6
Amortized cost | $ 12,651,338 | $ 12,873,329
Other Investments, Total | 12,172,961 | 12,877,087
Average exposure per issuer (fair value) | 2,028,827 | 2,146,181
Fair value | $ 12,172,961 | $ 12,877,087
Revenue Bonds [Member] | Other States [Member] |  |
Number of issuers | 12 | 11
Amortized cost | $ 13,863,760 | $ 13,805,340
Other Investments, Total | 13,206,470 | 13,716,132
Average exposure per issuer (fair value) | 1,100,539 | 1,246,921
Fair value | $ 13,206,470 | $ 13,716,132

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