Note 3 - Investment Securities (Details) - Amortized Cost and Fair Value of Securities by Contractual Maturity (USD $)	Dec. 31, 2014	Dec. 31, 2013
Securities held to maturity:
Due in one year or less	$ 13,233,202
Due in one year or less	13,236,032
Due after one year through five years	18,369,970
Due after one year through five years	18,455,551
Due after five years	168,276,402
Due after five years	169,422,213
	199,879,574us-gaap_HeldToMaturitySecurities
	201,113,796	138,640,105
Securities available for sale:
Due in one year or less	1,465,251
Due in one year or less	1,472,292
Due after one year through five years	92,324,465
Due after one year through five years	91,274,581
Due after five years	248,578,784
Due after five years	245,522,680
	342,368,500
	338,269,553
Securities with no stated maturity date, amortized cost	454,166,979
Securities with no stated maturity date, fair value	451,659,630
Residential Mortgage Backed Securities [Member]
Securities available for sale:
Securities with no stated maturity date, amortized cost	110,455,925
Securities with no stated maturity date, fair value	111,423,224
Other Securities [Member]
Securities held to maturity:
	1,050,000	1,050,000
Securities available for sale:
Securities with no stated maturity date, amortized cost	1,342,554
Securities with no stated maturity date, fair value	1,966,853
US States and Political Subdivisions Debt Securities [Member] \| Callable Securities [Member]
Securities available for sale:
Securities with no stated maturity date, amortized cost	17,823,260
Securities with no stated maturity date, fair value	18,324,081
Securities held to maturity:
Municipal securities	110,251,899
Municipal securities	111,121,516
US States and Political Subdivisions Debt Securities [Member]
Securities held to maturity:
	200,063,796	137,590,105
US Government-sponsored Enterprises Debt Securities [Member] \| Callable Securities [Member]
Securities available for sale:
Securities with no stated maturity date, amortized cost	232,619,254
Securities with no stated maturity date, fair value	228,580,781
Callable Securities [Member]
Securities available for sale:
Securities with no stated maturity date, amortized cost	250,442,514
Securities with no stated maturity date, fair value	$ 246,904,862

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