Note 2 - Investment Securities (Tables)

6 Months Ended

Jun. 30, 2016

Notes Tables

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

			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		(Losses)			Value
June 30, 2016:
Securities HTM:
Municipal securities	$	279,295,532	$	6,194,753	$	(731,170	)	$	284,759,115
Other securities		1,050,000		-		-			1,050,000
	$	280,345,532	$	6,194,753	$	(731,170	)	$	285,809,115
Securities AFS:
U.S. govt. sponsored agency securities	$	87,068,743	$	1,332,981	$	(80,276	)	$	88,321,448
Residential mortgage-backed and related securities		114,990,076		1,855,710		(80,276	)		116,765,510
Municipal securities		22,463,188		945,994		(16,365	)		23,392,817
Other securities		1,684,787		449,222		-			2,134,009
	$	226,206,794	$	4,583,907	$	(176,917	)	$	230,613,784
December 31, 2015:
Securities HTM:
Municipal securities	$	252,624,159	$	3,190,558	$	(1,173,432	)	$	254,641,285
Other securities		1,050,000		-		-			1,050,000
	$	253,674,159	$	3,190,558	$	(1,173,432	)	$	255,691,285
Securities AFS:
U.S. govt. sponsored agency securities	$	216,281,416	$	104,524	$	(2,848,561	)	$	213,537,379
Residential mortgage-backed and related securities		81,442,479		511,095		(1,283,439	)		80,670,135
Municipal securities		26,764,981		872,985		(59,378	)		27,578,588
Other securities		1,108,124		540,919		(163	)		1,648,880
	$	325,597,000	$	2,029,523	$	(4,191,541	)	$	323,434,982

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, 2016:
Securities HTM:
Municipal securities	$	5,805,354	$	(384,457	)	$	14,508,402	$	(346,713	)	$	20,313,756	$	(731,170	)
Securities AFS:
U.S. govt. sponsored agency securities	$	5,825,476	$	(80,276	)	$	-	$	-		$	5,825,476	$	(80,276	)
Residential mortgage-backed and related securities		4,337,187		(7,492	)		8,829,330		(72,784	)		13,166,517		(80,276	)
Municipal securities		380,749		(206	)		850,050		(16,159	)		1,230,799		(16,365	)
Other securities		-		-			-		-			-		-
	$	10,543,412	$	(87,974	)	$	9,679,380	$	(88,943	)	$	20,222,792	$	(176,917	)
December 31, 2015:
Securities HTM:
Municipal securities	$	14,803,408	$	(294,438	)	$	19,927,581	$	(878,994	)	$	34,730,989	$	(1,173,432	)
Securities AFS:
U.S. govt. sponsored agency securities	$	112,900,327	$	(1,397,591	)	$	64,476,661	$	(1,450,970	)	$	177,376,988	$	(2,848,561	)
Residential mortgage-backed and related securities		40,356,921		(730,466	)		19,836,637		(552,973	)		60,193,558		(1,283,439	)
Municipal securities		2,220,800		(31,807	)		848,329		(27,571	)		3,069,129		(59,378	)
Other securities		411		(163	)		-		-			411		(163	)
	$	155,478,459	$	(2,160,027	)	$	85,161,627	$	(2,031,514	)	$	240,640,086	$	(4,191,541	)

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

	Three Months Ended				Six Months Ended
	June 30, 2016		June 30, 2015		June 30, 2016			June 30, 2015
Proceeds from sales of securities	$	5,548,294	$	-	$	61,075,145		$	54,966,923
Pre-tax gross gains from sales of securities		18,030		-		533,545			569,551
Pre-tax gross losses from sales of securities		-		-		(157,035	)		(152,618	)

Investments Classified by Contractual Maturity Date [Table Text Block]

	Amortized Cost		Fair Value
Securities HTM:
Due in one year or less	$	4,972,563	$	4,993,619
Due after one year through five years		20,232,407		20,415,409
Due after five years		255,140,562		260,400,087
	$	280,345,532	$	285,809,115
Securities AFS:
Due in one year or less	$	2,133,829	$	2,141,186
Due after one year through five years		54,381,038		55,669,426
Due after five years		53,017,064		53,903,653
	$	109,531,931	$	111,714,265
Residential mortgage-backed and related securities		114,990,076		116,765,510
Other securities		1,684,787		2,134,009
	$	226,206,794	$	230,613,784

	Amortized Cost		Fair Value
Securities HTM:
Municipal securities	$	153,065,142	$	156,170,970
Securities AFS:
U.S. govt. sponsored agency securities		23,616,009		23,718,901
Municipal securities		13,844,290		14,296,378
	$	37,460,299	$	38,015,279

Schedule of Debt [Table Text Block]

June 30, 2016:
U.S. State:	Number of Issuers		Amortized Cost		Fair Value		Average Exposure Per Issuer (Fair Value)
Iowa		13	$	19,441,057	$	19,965,926	$	1,535,840
Illinois		9		10,127,747		10,527,337		1,169,704
Missouri		12		7,349,505		7,519,474		626,623
North Dakota		6		16,208,320		16,872,189		2,812,032
Other		37		13,738,908		14,133,036		381,974
Total general obligation bonds		77	$	66,865,537	$	69,017,962	$	896,337

December 31, 2015:
U.S. State:	Number of Issuers		Amortized Cost		Fair Value		Average Exposure Per Issuer (Fair Value)
Iowa		15	$	19,974,939	$	20,247,108	$	1,349,807
Illinois		9		10,928,700		11,264,348		1,251,594
North Dakota		5		10,890,000		11,050,235		2,210,047
Missouri		12		7,924,800		7,986,856		665,571
Other		41		16,965,393		17,229,485		420,231
Total general obligation bonds		82	$	66,683,832	$	67,778,032	$	826,561

June 30, 2016:
U.S. State:	Number of Issuers		Amortized Cost		Fair Value		Average Exposure Per Issuer (Fair Value)
Missouri		41	$	89,033,470	$	90,174,695	$	2,199,383
Iowa		26		73,076,794		74,933,480		2,882,057
Indiana		18		40,009,789		40,615,477		2,256,415
Kansas		5		13,172,824		13,315,662		2,663,132
North Dakota		4		8,161,630		8,359,661		2,089,915
Other		5		11,438,676		11,734,995		2,346,999
Total revenue bonds		99	$	234,893,183	$	239,133,970	$	2,415,495

December 31, 2015:
U.S. State:	Number of Issuers		Amortized Cost		Fair Value		Average Exposure Per Issuer (Fair Value)
Missouri		41	$	78,593,590	$	79,015,378	$	1,927,204
Iowa		26		70,773,660		71,659,410		2,756,131
Indiana		17		40,018,381		40,210,320		2,365,313
Kansas		3		11,748,679		11,821,055		3,940,352
Other		5		11,570,998		11,735,678		2,347,136
Total revenue bonds		92	$	212,705,308	$	214,441,841	$	2,330,890