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Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($)
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General Obligation Bonds [Member] |  |
Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 78 | 77
Amortized cost | $ 56,989,724 | $ 67,868,415
Fair value | 57,299,775 | 68,768,171
Average exposure per issuer (fair value) | $ 734,613 | $ 893,093
General Obligation Bonds [Member] | IOWA |  |
Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 16 | 14
Amortized cost | $ 19,725,988 | $ 20,156,969
Fair value | 19,629,187 | 20,446,655
Average exposure per issuer (fair value) | $ 1,226,824 | $ 1,460,475
General Obligation Bonds [Member] | MISSOURI |  |
Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 12 | 11
Amortized cost | $ 7,903,655 | $ 8,424,928
Fair value | 7,859,378 | 8,426,047
Average exposure per issuer (fair value) | $ 654,948 | $ 766,004
General Obligation Bonds [Member] | ILLINOIS |  |
Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 9 | 10
Amortized cost | $ 11,888,959 | $ 22,447,799
Fair value | 12,168,493 | 22,784,638
Average exposure per issuer (fair value) | $ 1,352,055 | $ 2,278,464
General Obligation Bonds [Member] | Other States [Member] |  |
Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 41 | 42
Amortized cost | $ 17,471,122 | $ 16,838,719
Fair value | 17,642,717 | 17,110,831
Average exposure per issuer (fair value) | $ 430,310 | $ 407,401
Revenue Bonds [Member] |  |
Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 81 | 64
Amortized cost | $ 194,248,658 | $ 160,369,899
Fair value | 193,095,109 | 161,695,606
Average exposure per issuer (fair value) | $ 2,383,890 | $ 2,526,494
Revenue Bonds [Member] | IOWA |  |
Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 25 | 20
Amortized cost | $ 72,138,865 | $ 59,417,246
Fair value | 72,156,897 | 60,402,941
Average exposure per issuer (fair value) | $ 2,886,276 | $ 3,020,147
Revenue Bonds [Member] | MISSOURI |  |
Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 34 | 30
Amortized cost | $ 66,832,018 | $ 62,358,276
Fair value | 66,174,793 | 62,584,516
Average exposure per issuer (fair value) | $ 1,946,317 | $ 2,086,151
Revenue Bonds [Member] | Other States [Member] |  |
Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 4 | 4
Amortized cost | $ 7,893,263 | $ 8,295,311
Fair value | 8,006,048 | 8,449,900
Average exposure per issuer (fair value) | $ 2,001,512 | $ 2,112,475
Revenue Bonds [Member] | INDIANA |  |
Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 15 | 8
Amortized cost | $ 35,440,200 | $ 17,991,200
Fair value | 35,161,046 | 17,925,721
Average exposure per issuer (fair value) | $ 2,344,070 | $ 2,240,715
Revenue Bonds [Member] | KANSAS |  |
Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 3 | 2
Amortized cost | $ 11,944,312 | $ 12,307,866
Fair value | 11,596,325 | 12,332,528
Average exposure per issuer (fair value) | $ 3,865,442 | $ 6,166,264

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