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Note 3 - Investment Securities (Details) - Amortized Cost and Fair Values of General Obligation Bonds by Issuer's State | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
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General Obligation Bonds [Member] |  |
Note 3 - Investment Securities (Details) - Amortized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 82 | 77
Amortized cost | $ 66,683,832 | $ 67,868,415
Fair value | 67,778,032 | 68,768,171
Average exposure per issuer (fair value) | $ 826,561 | $ 893,093
General Obligation Bonds [Member] | IOWA |  |
Note 3 - Investment Securities (Details) - Amortized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 15 | 14
Amortized cost | $ 19,974,939 | $ 20,156,969
Fair value | 20,247,108 | 20,446,655
Average exposure per issuer (fair value) | $ 1,349,807 | $ 1,460,475
General Obligation Bonds [Member] | ILLINOIS |  |
Note 3 - Investment Securities (Details) - Amortized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 9 | 10
Amortized cost | $ 10,928,700 | $ 22,447,799
Fair value | 11,264,348 | 22,784,638
Average exposure per issuer (fair value) | $ 1,251,594 | $ 2,278,464
General Obligation Bonds [Member] | NORTH DAKOTA |  |
Note 3 - Investment Securities (Details) - Amortized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 5 |
Amortized cost | $ 10,890,000 |
Fair value | 11,050,235 |
Average exposure per issuer (fair value) | $ 2,210,047 |
General Obligation Bonds [Member] | MISSOURI |  |
Note 3 - Investment Securities (Details) - Amortized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 12 | 11
Amortized cost | $ 7,924,800 | $ 8,424,928
Fair value | 7,986,856 | 8,426,047
Average exposure per issuer (fair value) | $ 665,571 | $ 766,004
General Obligation Bonds [Member] | Other States [Member] |  |
Note 3 - Investment Securities (Details) - Amortized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 41 | 42
Amortized cost | $ 16,965,393 | $ 16,838,719
Fair value | 17,229,485 | 17,110,831
Average exposure per issuer (fair value) | $ 420,231 | $ 407,401
Revenue Bonds [Member] |  |
Note 3 - Investment Securities (Details) - Amortized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 92 | 64
Amortized cost | $ 212,705,308 | $ 160,369,899
Fair value | 214,441,841 | 161,695,606
Average exposure per issuer (fair value) | $ 2,330,890 | $ 2,526,494
Revenue Bonds [Member] | IOWA |  |
Note 3 - Investment Securities (Details) - Amortized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 26 | 20
Amortized cost | $ 70,773,660 | $ 59,417,246
Fair value | 71,659,410 | 60,402,941
Average exposure per issuer (fair value) | $ 2,756,131 | $ 3,020,147
Revenue Bonds [Member] | MISSOURI |  |
Note 3 - Investment Securities (Details) - Amortized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 41 | 30
Amortized cost | $ 78,593,590 | $ 62,358,276
Fair value | 79,015,378 | 62,584,516
Average exposure per issuer (fair value) | $ 1,927,204 | $ 2,086,151
Revenue Bonds [Member] | Other States [Member] |  |
Note 3 - Investment Securities (Details) - Amortized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 5 | 4
Amortized cost | $ 11,570,998 | $ 8,295,311
Fair value | 11,735,678 | 8,449,900
Average exposure per issuer (fair value) | $ 2,347,136 | $ 2,112,475
Revenue Bonds [Member] | INDIANA |  |
Note 3 - Investment Securities (Details) - Amortized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 17 | 8
Amortized cost | $ 40,018,381 | $ 17,991,200
Fair value | 40,210,320 | 17,925,721
Average exposure per issuer (fair value) | $ 2,365,313 | $ 2,240,715
Revenue Bonds [Member] | KANSAS |  |
Note 3 - Investment Securities (Details) - Amortized Cost and Fair Values of General Obligation Bonds by Issuer's State [Line Items] |  |
Number of issuers | 3 | 2
Amortized cost | $ 11,748,679 | $ 12,307,866
Fair value | 11,821,055 | 12,332,528
Average exposure per issuer (fair value) | $ 3,940,352 | $ 6,166,264

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