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Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Investment Securities - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Securities held to maturity:    
Securities held to maturity, amortized cost $ 261,129,586 $ 253,674,159
Securities held to maturity, gross unrealized gains 4,143,965 3,190,558
Securities held to maturity, gross unrealized losses (858,829) (1,173,432)
Securities held to maturity, fair value 264,414,722 255,691,285
Securities available for sale:    
Securities available for sale, amortized cost 273,844,647 325,597,000
Securities available for sale, gross unrealized gains 2,814,866 2,029,523
Securities available for sale, gross unrealized losses (471,646) (4,191,541)
Securities available for sale, fair value 276,187,867 323,434,982
US States and Political Subdivisions Debt Securities [Member]    
Securities held to maturity:    
Securities held to maturity, amortized cost 260,079,586 252,624,159
Securities held to maturity, gross unrealized gains 4,143,965 3,190,558
Securities held to maturity, gross unrealized losses (858,829) (1,173,432)
Securities held to maturity, fair value 263,364,722 254,641,285
Securities available for sale:    
Securities available for sale, amortized cost 24,113,773 26,764,981
Securities available for sale, gross unrealized gains 839,125 872,985
Securities available for sale, gross unrealized losses (23,243) (59,378)
Securities available for sale, fair value 24,929,655 27,578,588
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 1,637,366 1,108,124
Securities available for sale, gross unrealized gains 428,027 540,919
Securities available for sale, gross unrealized losses (1,377) (163)
Securities available for sale, fair value 2,064,016 1,648,880
US Government Agencies Debt Securities [Member]    
Securities available for sale:    
Securities available for sale, amortized cost 132,080,737 216,281,416
Securities available for sale, gross unrealized gains 786,623 104,524
Securities available for sale, gross unrealized losses (125,538) (2,848,561)
Securities available for sale, fair value 132,741,822 213,537,379
Residential Mortgage Backed Securities [Member]    
Securities available for sale:    
Securities available for sale, amortized cost 116,012,771 81,442,479
Securities available for sale, gross unrealized gains 761,091 511,095
Securities available for sale, gross unrealized losses (321,488) (1,283,439)
Securities available for sale, fair value $ 116,452,374 $ 80,670,135