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Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Investment Securities - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Securities held to maturity:    
Securities held to maturity, amortized cost $ 238,640,598 $ 199,879,574
Securities held to maturity, gross unrealized gains 2,429,898 2,420,298
Securities held to maturity, gross unrealized losses (1,649,655) (1,186,076)
Securities held to maturity, fair value 239,420,841 201,113,796
Securities available for sale:    
Securities available for sale, amortized cost 350,516,614 454,166,979
Securities available for sale, gross unrealized gains 3,075,620 3,360,874
Securities available for sale, gross unrealized losses (1,457,883) (5,868,223)
Securities available for sale, fair value 352,134,351 451,659,630
US States and Political Subdivisions Debt Securities [Member]    
Securities held to maturity:    
Securities held to maturity, amortized cost 237,590,598 198,829,574
Securities held to maturity, gross unrealized gains 2,429,898 2,420,298
Securities held to maturity, gross unrealized losses (1,649,655) (1,186,076)
Securities held to maturity, fair value 238,370,841 200,063,796
Securities available for sale:    
Securities available for sale, amortized cost 26,815,175 29,408,740
Securities available for sale, gross unrealized gains 925,922 1,053,713
Securities available for sale, gross unrealized losses (39,445) (62,472)
Securities available for sale, fair value 27,701,652 30,399,981
Other Securities [Member]    
Securities held to maturity:    
Securities held to maturity, amortized cost 1,050,000 1,050,000
Securities held to maturity, fair value 1,050,000 1,050,000
Securities available for sale:    
Securities available for sale, amortized cost 1,344,814 1,342,554
Securities available for sale, gross unrealized gains 633,415 625,145
Securities available for sale, gross unrealized losses (71,680) (846)
Securities available for sale, fair value 1,906,549 1,966,853
US Government Agencies Debt Securities [Member]    
Securities available for sale:    
Securities available for sale, amortized cost 247,911,701 312,959,760
Securities available for sale, gross unrealized gains 577,904 173,685
Securities available for sale, gross unrealized losses (865,014) (5,263,873)
Securities available for sale, fair value 247,624,591 307,869,572
Residential Mortgage Backed Securities [Member]    
Securities available for sale:    
Securities available for sale, amortized cost 74,444,924 110,455,925
Securities available for sale, gross unrealized gains 938,379 1,508,331
Securities available for sale, gross unrealized losses (481,744) (541,032)
Securities available for sale, fair value $ 74,901,559 $ 111,423,224