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Note 2 - Investment Securities - Amortized Cost and Fair Values of General Obligation Bonds by Issuer's State (Details) | Sep. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
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General Obligation Bonds [Member] | Iowa [Member] |  |
Number of issuers | 27 | 15
Amortized cost | $ 32,289,974 | $ 19,974,939
Other Investments | 32,746,465 | 20,247,108
Average exposure per issuer (fair value) | $ 1,212,832 | $ 1,349,807
General Obligation Bonds [Member] | Missouri [Member] |  |
Number of issuers | 13 | 12
Amortized cost | $ 8,304,022 | $ 7,924,800
Other Investments | 8,448,994 | 7,986,856
Average exposure per issuer (fair value) | $ 649,923 | $ 665,571
General Obligation Bonds [Member] | Illinois [Member] |  |
Number of issuers | 19 | 9
Amortized cost | $ 30,063,690 | $ 10,928,700
Other Investments | 30,437,115 | 11,264,348
Average exposure per issuer (fair value) | $ 1,601,953 | $ 1,251,594
General Obligation Bonds [Member] | North Dakota [Member] |  |
Number of issuers | 6 | 5
Amortized cost | $ 19,403,728 | $ 10,890,000
Other Investments | 19,906,421 | 11,050,235
Average exposure per issuer (fair value) | $ 3,317,737 | $ 2,210,047
General Obligation Bonds [Member] | Other States [Member] |  |
Number of issuers | 49 | 41
Amortized cost | $ 23,934,196 | $ 16,965,393
Other Investments | 24,247,257 | 17,229,485
Average exposure per issuer (fair value) | $ 494,842 | $ 420,231
General Obligation Bonds [Member] |  |
Number of issuers | 114 | 82
Amortized cost | $ 113,995,610 | $ 66,683,832
Other Investments | 115,786,252 | 67,778,032
Average exposure per issuer (fair value) | $ 1,015,669 | $ 826,561
Revenue Bonds [Member] | Iowa [Member] |  |
Number of issuers | 30 | 26
Amortized cost | $ 75,440,709 | $ 70,773,660
Other Investments | 77,216,784 | 71,659,410
Average exposure per issuer (fair value) | $ 2,573,893 | $ 2,756,131
Revenue Bonds [Member] | Missouri [Member] |  |
Number of issuers | 44 | 41
Amortized cost | $ 90,171,820 | $ 78,593,590
Other Investments | 91,084,628 | 79,015,378
Average exposure per issuer (fair value) | $ 2,070,105 | $ 1,927,204
Revenue Bonds [Member] | North Dakota [Member] |  |
Number of issuers | 4 |
Amortized cost | $ 8,114,931 |
Other Investments | 8,175,230 |
Average exposure per issuer (fair value) | $ 2,043,808 |
Revenue Bonds [Member] | Indiana [Member] |  |
Number of issuers | 20 | 17
Amortized cost | $ 43,994,737 | $ 40,018,381
Other Investments | 44,605,536 | 40,210,320
Average exposure per issuer (fair value) | $ 2,230,277 | $ 2,365,313
Revenue Bonds [Member] | Kansas [Member] |  |
Number of issuers | 6 | 3
Amortized cost | $ 13,480,269 | $ 11,748,679
Other Investments | 13,587,744 | 11,821,055
Average exposure per issuer (fair value) | $ 2,264,624 | $ 3,940,352
Revenue Bonds [Member] | Other States [Member] |  |
Number of issuers | 8 | 5
Amortized cost | $ 14,379,998 | $ 11,570,998
Other Investments | 14,628,631 | 11,735,678
Average exposure per issuer (fair value) | $ 1,828,579 | $ 2,347,136
Revenue Bonds [Member] |  |
Number of issuers | 112 | 92
Amortized cost | $ 245,582,464 | $ 212,705,308
Other Investments | 249,298,553 | 214,441,841
Average exposure per issuer (fair value) | $ 2,225,880 | $ 2,330,890

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