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Note 2 - Investment Securities - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Securities HTM:    
Securities held to maturity, at amortized cost $ 324,203,634 $ 322,909,056
Securities held to maturity, gross unrealized gains 2,027,969 2,200,577
Securities held to maturity, gross unrealized (losses) (3,242,226) (4,694,734)
322,989,377 320,414,899
Securities available for sale, gross unrealized gains 1,592,903 1,437,658
Securities available for sale, gross unrealized (losses) (2,359,129) (3,933,920)
Securities available for sale, fair value 269,281,713 251,113,139
Securities AFS:    
Securities available for sale, amortized cost 270,047,939 253,609,401
US States and Political Subdivisions Debt Securities [Member]    
Securities HTM:    
Securities held to maturity, at amortized cost 323,153,634 321,859,056
Securities held to maturity, gross unrealized gains 2,027,969 2,200,577
Securities held to maturity, gross unrealized (losses) (3,242,226) (4,694,734)
321,939,377 319,364,899
Securities available for sale, gross unrealized gains 471,713 425,801
Securities available for sale, gross unrealized (losses) (252,541) (637,916)
Securities available for sale, fair value 58,100,510 52,604,426
Securities AFS:    
Securities available for sale, amortized cost 57,881,338 52,816,541
Other Securities [Member]    
Securities HTM:    
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, gross unrealized gains 778,988 703,978
Securities available for sale, gross unrealized (losses) (22,550) (27,331)
Securities available for sale, fair value 4,821,906 4,722,979
Securities AFS:    
Securities available for sale, amortized cost 4,065,468 4,046,332
US Government Agencies Debt Securities [Member]    
Securities HTM:    
Securities available for sale, gross unrealized gains 96,651 132,886
Securities available for sale, gross unrealized (losses) (189,347) (330,585)
Securities available for sale, fair value 41,944,464 46,083,607
Securities AFS:    
Securities available for sale, amortized cost 42,037,160 46,281,306
Residential Mortgage Backed Securities [Member]    
Securities HTM:    
Securities available for sale, gross unrealized gains 245,551 174,993
Securities available for sale, gross unrealized (losses) (1,894,691) (2,938,088)
Securities available for sale, fair value 164,414,833 147,702,127
Securities AFS:    
Securities available for sale, amortized cost $ 166,063,973 $ 150,465,222