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Note 3 - Investment Securities - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Securities held to maturity:    
Securities held to maturity, at amortized cost $ 322,909,056 $ 253,674,159
Securities held to maturity, gross unrealized gains 2,200,577 3,190,558
Securities held to maturity, gross unrealized (losses) (4,694,734) (1,173,432)
320,414,899 255,691,285
Securities available for sale:    
Securities available for sale, amortized cost 253,609,401 325,597,000
Securities available for sale, gross unrealized gains 1,437,658 2,029,523
Securities available for sale, gross unrealized (losses) (3,933,920) (4,191,541)
Securities available for sale, fair value 251,113,139 323,434,982
US States and Political Subdivisions Debt Securities [Member]    
Securities held to maturity:    
Securities held to maturity, at amortized cost 321,859,056 252,624,159
Securities held to maturity, gross unrealized gains 2,200,577 3,190,558
Securities held to maturity, gross unrealized (losses) (4,694,734) (1,173,432)
319,364,899 254,641,285
Securities available for sale:    
Securities available for sale, amortized cost 52,816,541 26,764,981
Securities available for sale, gross unrealized gains 425,801 872,985
Securities available for sale, gross unrealized (losses) (637,916) (59,378)
Securities available for sale, fair value 52,604,426 27,578,588
Other Securities [Member]    
Securities held to maturity:    
Securities held to maturity, at amortized cost 1,050,000 1,050,000
Securities held to maturity, gross unrealized gains  
Securities held to maturity, gross unrealized (losses)  
1,050,000 1,050,000
Securities available for sale:    
Securities available for sale, amortized cost 4,046,332 1,108,124
Securities available for sale, gross unrealized gains 703,978 540,919
Securities available for sale, gross unrealized (losses) (27,331) (163)
Securities available for sale, fair value 4,722,979 1,648,880
US Government Agencies Debt Securities [Member]    
Securities available for sale:    
Securities available for sale, amortized cost 46,281,306 216,281,416
Securities available for sale, gross unrealized gains 132,886 104,524
Securities available for sale, gross unrealized (losses) (330,585) (2,848,561)
Securities available for sale, fair value 46,083,607 213,537,379
Residential Mortgage Backed Securities [Member]    
Securities available for sale:    
Securities available for sale, amortized cost 150,465,222 81,442,479
Securities available for sale, gross unrealized gains 174,993 511,095
Securities available for sale, gross unrealized (losses) (2,938,088) (1,283,439)
Securities available for sale, fair value $ 147,702,127 $ 80,670,135