Note 2 - Investment Securities (Tables)

6 Months Ended

Jun. 30, 2015

Note 2 - Investment Securities (Tables) [Line Items]

Unrealized Gain (Loss) on Investments [Table Text Block]

			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		(Losses)			Value
June 30, 2015
Securities held to maturity:
Municipal securities	$	224,088,234	$	1,576,216	$	(3,173,269	)	$	222,491,181
Other securities		1,050,000		-		-			1,050,000
	$	225,138,234	$	1,576,216	$	(3,173,269	)	$	223,541,181
Securities available for sale:
U.S. govt. sponsored agency securities	$	260,141,312	$	222,875	$	(3,920,526	)	$	256,443,661
Residential mortgage-backed and related securities		81,029,967		893,687		(1,079,832	)		80,843,822
Municipal securities		27,150,148		855,670		(102,115	)		27,903,703
Other securities		1,389,291		654,319		(5,013	)		2,038,597
	$	369,710,718	$	2,626,551	$	(5,107,486	)	$	367,229,783
December 31, 2014:
Securities held to maturity:
Municipal securities	$	198,829,574	$	2,420,298	$	(1,186,076	)	$	200,063,796
Other securities		1,050,000		-		-			1,050,000
	$	199,879,574	$	2,420,298	$	(1,186,076	)	$	201,113,796
Securities available for sale:
U.S. govt. sponsored agency securities	$	312,959,760	$	173,685	$	(5,263,873	)	$	307,869,572
Residential mortgage-backed and related securities		110,455,925		1,508,331		(541,032	)		111,423,224
Municipal securities		29,408,740		1,053,713		(62,472	)		30,399,981
Other securities		1,342,554		625,145		(846	)		1,966,853
	$	454,166,979	$	3,360,874	$	(5,868,223	)	$	451,659,630

Schedule of Unrealized Loss on Investments [Table Text Block]

	Less than 12 Months					12 Months or More					Total
			Gross					Gross					Gross
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
	Value		Losses			Value		Losses			Value		Losses
June 30, 2015:
Securities held to maturity:
Municipal securities	$	76,375,019	$	(2,218,961	)	$	34,698,604	$	(954,308	)	$	111,073,623	$	(3,173,269	)
Securities available for sale:
U.S. govt. sponsored agency securities	$	138,963,817	$	(1,920,958	)	$	87,910,053	$	(1,999,568	)	$	226,873,870	$	(3,920,526	)
Residential mortgage-backed and related securities		31,047,920		(413,983	)		21,312,400		(665,849	)		52,360,320		(1,079,832	)
Municipal securities		4,417,658		(49,532	)		1,322,180		(52,583	)		5,739,838		(102,115	)
Other securities		239,415		(5,013	)		-		-			239,415		(5,013	)
	$	174,668,810	$	(2,389,486	)	$	110,544,633	$	(2,718,000	)	$	285,213,443	$	(5,107,486	)
December 31, 2014:
Securities held to maturity:
Municipal securities	$	20,419,052	$	(587,992	)	$	38,779,545	$	(598,084	)	$	59,198,597	$	(1,186,076	)
Securities available for sale:
U.S. govt. sponsored agency securities	$	23,970,085	$	(102,695	)	$	255,743,056	$	(5,161,178	)	$	279,713,141	$	(5,263,873	)
Residential mortgage-backed and related securities		10,710,671		(10,139	)		37,570,774		(530,893	)		48,281,445		(541,032	)
Municipal securities		920,935		(1,773	)		4,425,337		(60,699	)		5,346,272		(62,472	)
Other securities		243,004		(846	)		-		-			243,004		(846	)
	$	35,844,695	$	(115,453	)	$	297,739,167	$	(5,752,770	)	$	333,583,862	$	(5,868,223	)

Realized Gain (Loss) on Investments [Table Text Block]

	Three Months Ended				Six Months Ended
	June 30, 2015		June 30, 2014		June 30, 2015			June 30, 2014
Proceeds from sales of securities	$	-	$	18,856,953	$	54,966,923		$	25,877,578
Pre-tax gross gains from sales of securities		-		571		569,551			21,196
Pre-tax gross losses from sales of securities		-		-		(152,618	)		-

Investments Classified by Contractual Maturity Date [Table Text Block]

	Amortized Cost		Fair Value
Securities held to maturity:
Due in one year or less	$	4,400,190	$	4,406,723
Due after one year through five years		16,813,102		16,900,556
Due after five years		203,924,942		202,233,902
	$	225,138,234	$	223,541,181
Securities available for sale:
Due in one year or less	$	1,642,213	$	1,648,864
Due after one year through five years		117,746,437		117,089,821
Due after five years		167,902,810		165,608,679
	$	287,291,460	$	284,347,364
Residential mortgage-backed and related securities		81,029,967		80,843,822
Other securities		1,389,291		2,038,597
	$	369,710,718	$	367,229,783

	Amortized Cost		Fair Value
Securities held to maturity:
Municipal securities	$	126,157,613	$	125,222,912
Securities available for sale:
U.S. govt. sponsored agency securities		171,504,664		168,429,493
Municipal securities		16,797,862		17,134,333
	$	188,302,526	$	185,563,826

Schedule of Debt [Table Text Block]

	June 30, 2015		December 31, 2014
Wholesale structured repurchase agreements	$	115,000,000	$	130,000,000
Term note		-		17,625,000
Series A subordinated notes		-		2,657,492
	$	115,000,000	$	150,282,492

Bonds [Member]

Note 2 - Investment Securities (Tables) [Line Items]

Schedule of Debt [Table Text Block]

U.S. State:	Number of Issuers		Amortized Cost		Fair Value		Average Exposure Per Issuer (Fair Value)
Iowa		16	$	19,725,988	$	19,629,187	$	1,226,824
Missouri		12		7,903,655		7,859,378		654,948
Illinois		9		11,888,959		12,168,493		1,352,055
Other		41		17,471,122		17,642,717		430,310
Total general obligation bonds		78	$	56,989,724	$	57,299,775	$	734,613

U.S. State:	Number of Issuers		Amortized Cost		Fair Value		Average Exposure Per Issuer (Fair Value)
Iowa		14	$	20,156,969	$	20,446,655	$	1,460,475
Missouri		11		8,424,928		8,426,047		766,004
Illinois		10		22,447,799		22,784,638		2,278,464
Other		42		16,838,719		17,110,831		407,401
Total general obligation bonds		77	$	67,868,415	$	68,768,171	$	893,093

U.S. State:	Number of Issuers		Amortized Cost		Fair Value		Average Exposure Per Issuer (Fair Value)
Iowa		25	$	72,138,865	$	72,156,897	$	2,886,276
Missouri		34		66,832,018		66,174,793		1,946,317
Indiana		15		35,440,200		35,161,046		2,344,070
Kansas		3		11,944,312		11,596,325		3,865,442
Other		4		7,893,263		8,006,048		2,001,512
Total revenue bonds		81	$	194,248,658	$	193,095,109	$	2,383,890

U.S. State:	Number of Issuers		Amortized Cost		Fair Value		Average Exposure Per Issuer (Fair Value)
Iowa		20	$	59,417,246	$	60,402,941	$	3,020,147
Missouri		30		62,358,276		62,584,516		2,086,151
Indiana		8		17,991,200		17,925,721		2,240,715
Kansas		2		12,307,866		12,332,528		6,166,264
Other		4		8,295,311		8,449,900		2,112,475
Total revenue bonds		64	$	160,369,899	$	161,695,606	$	2,526,494