Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Securities by Contractual Maturity (USD $)	Mar. 31, 2015	Dec. 31, 2014
Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Securities by Contractual Maturity [Line Items]
Due in one year or less	$ 3,866,598
Due in one year or less	3,871,276
Due after one year through five years	18,512,988
Due after one year through five years	18,595,028
Due after five years	192,766,585
Due after five years	193,170,693
	215,146,171us-gaap_HeldToMaturitySecurities
	215,636,997	201,113,796
Due in one year or less	34,982,411
Due in one year or less	34,994,562
Due after one year through five years	104,102,115
Due after one year through five years	104,066,092
Due after five years	189,696,419
Due after five years	189,832,915
	328,780,945
	328,893,569
Amortized Cost	420,784,178
Fair Value	422,258,100
Residential Mortgage Backed Securities [Member]
Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Securities by Contractual Maturity [Line Items]
Amortized Cost	90,632,701
Fair Value	91,363,300
Other Securities [Member]
Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Securities by Contractual Maturity [Line Items]
	1,050,000	1,050,000
Amortized Cost	1,370,532
Fair Value	2,001,231
US States and Political Subdivisions Debt Securities [Member] \| Callable Securities [Member]
Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Securities by Contractual Maturity [Line Items]
Amortized Cost	17,800,256
Fair Value	18,353,901
Municipal securities	127,760,995
Municipal securities	128,323,293
US States and Political Subdivisions Debt Securities [Member]
Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Securities by Contractual Maturity [Line Items]
	214,586,997	200,063,796
US Government-sponsored Enterprises Debt Securities [Member] \| Callable Securities [Member]
Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Securities by Contractual Maturity [Line Items]
Amortized Cost	185,507,330
Fair Value	184,490,370
Callable Securities [Member]
Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Securities by Contractual Maturity [Line Items]
Amortized Cost	203,307,586
Fair Value	$ 202,844,271

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.