Note 2 - Investment Securities (Details) - Amoritized Cost and Fair Values of General Obligation Bonds by Issuer's State (USD $)	Mar. 31, 2015	Dec. 31, 2014
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	15	14
Amortized cost	$ 21,431,325	$ 20,156,969
Fair value	21,602,520	20,446,655
Average exposure per issuer (fair value)	1,440,168	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	11	11
Amortized cost	7,091,686	8,424,928
Fair value	7,085,546	8,426,047
Average exposure per issuer (fair value)	644,141	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	11,925,483	22,447,799
Fair value	12,255,809	22,784,638
Average exposure per issuer (fair value)	1,361,757	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	35	42
Amortized cost	14,918,372	16,838,719
Fair value	15,295,418	17,110,831
Average exposure per issuer (fair value)	437,012	407,401
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	70	77
Amortized cost	55,366,866	67,868,415
Fair value	56,239,293	68,768,171
Average exposure per issuer (fair value)	803,418	893,093
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	73,326,036	59,417,246
Fair value	73,890,396	60,402,941
Average exposure per issuer (fair value)	2,955,616	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	35	30
Amortized cost	66,627,817	62,358,276
Fair value	66,749,366	62,584,516
Average exposure per issuer (fair value)	1,907,125	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	10	4
Amortized cost	9,740,846	8,295,311
Fair value	9,923,138	8,449,900
Average exposure per issuer (fair value)	992,314	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	11	8
Amortized cost	25,563,200	17,991,200
Fair value	25,397,220	17,925,721
Average exposure per issuer (fair value)	2,308,838	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	12,120,688	12,307,866
Fair value	12,100,898	12,332,528
Average exposure per issuer (fair value)	4,033,633	6,166,264
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	84	64
Amortized cost	187,378,587	160,369,899
Fair value	188,061,018	161,695,606
Average exposure per issuer (fair value)	$ 2,238,822	$ 2,526,494