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Note 2 - Amortized Cost and Fair Values of General Obligation Bonds by Issuer's State (Details) | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
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General Obligation Bonds [Member] | Iowa [Member] |  |
Number of issuers | 13 | 15
Amortized cost | $ 19,441,057 | $ 19,974,939
Fair value | 19,965,926 | 20,247,108
Average exposure per issuer (fair value) | $ 1,535,840 | $ 1,349,807
General Obligation Bonds [Member] | Missouri [Member] |  |
Number of issuers | 12 | 12
Amortized cost | $ 7,349,505 | $ 7,924,800
Fair value | 7,519,474 | 7,986,856
Average exposure per issuer (fair value) | $ 626,623 | $ 665,571
General Obligation Bonds [Member] | Illinois [Member] |  |
Number of issuers | 9 | 9
Amortized cost | $ 10,127,747 | $ 10,928,700
Fair value | 10,527,337 | 11,264,348
Average exposure per issuer (fair value) | $ 1,169,704 | $ 1,251,594
General Obligation Bonds [Member] | North Dakota [Member] |  |
Number of issuers | 6 | 5
Amortized cost | $ 16,208,320 | $ 10,890,000
Fair value | 16,872,189 | 11,050,235
Average exposure per issuer (fair value) | $ 2,812,032 | $ 2,210,047
General Obligation Bonds [Member] | Other States [Member] |  |
Number of issuers | 37 | 41
Amortized cost | $ 13,738,908 | $ 16,965,393
Fair value | 14,133,036 | 17,229,485
Average exposure per issuer (fair value) | $ 381,974 | $ 420,231
General Obligation Bonds [Member] |  |
Number of issuers | 77 | 82
Amortized cost | $ 66,865,537 | $ 66,683,832
Fair value | 69,017,962 | 67,778,032
Average exposure per issuer (fair value) | $ 896,337 | $ 826,561
Revenue Bonds [Member] | Iowa [Member] |  |
Number of issuers | 26 | 26
Amortized cost | $ 73,076,794 | $ 70,773,660
Fair value | 74,933,480 | 71,659,410
Average exposure per issuer (fair value) | $ 2,882,057 | $ 2,756,131
Revenue Bonds [Member] | Missouri [Member] |  |
Number of issuers | 41 | 41
Amortized cost | $ 89,033,470 | $ 78,593,590
Fair value | 90,174,695 | 79,015,378
Average exposure per issuer (fair value) | $ 2,199,383 | $ 1,927,204
Revenue Bonds [Member] | North Dakota [Member] |  |
Number of issuers | 4 |
Amortized cost | $ 8,161,630 |
Fair value | 8,359,661 |
Average exposure per issuer (fair value) | $ 2,089,915 |
Revenue Bonds [Member] | Indiana [Member] |  |
Number of issuers | 18 | 17
Amortized cost | $ 40,009,789 | $ 40,018,381
Fair value | 40,615,477 | 40,210,320
Average exposure per issuer (fair value) | $ 2,256,415 | $ 2,365,313
Revenue Bonds [Member] | Kansas [Member] |  |
Number of issuers | 5 | 3
Amortized cost | $ 13,172,824 | $ 11,748,679
Fair value | 13,315,662 | 11,821,055
Average exposure per issuer (fair value) | $ 2,663,132 | $ 3,940,352
Revenue Bonds [Member] | Other States [Member] |  |
Number of issuers | 5 | 5
Amortized cost | $ 11,438,676 | $ 11,570,998
Fair value | 11,734,995 | 11,735,678
Average exposure per issuer (fair value) | $ 2,346,999 | $ 2,347,136
Revenue Bonds [Member] |  |
Number of issuers | 99 | 92
Amortized cost | $ 234,893,183 | $ 212,705,308
Fair value | 239,133,970 | 214,441,841
Average exposure per issuer (fair value) | $ 2,415,495 | $ 2,330,890

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