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Note 2 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Securities held to maturity, less than 12 months, fair value $ 70,443,057  
Securities held to maturity, less than 12 months, gross unrealized losses (2,892,207)  
Securities held to maturity, 12 months or more, fair value 59,545,239  
Securities held to maturity, 12 months or more, gross unrealized losses (2,143,665)  
Securities held to maturity, fair value 129,988,296  
Securities held to maturity, gross unrealized losses (5,035,872)  
Securities available for sale, less than 12 months, fair value 160,591,830 $ 128,656,909
Securities available for sale, less than 12 months, gross unrealized losses (4,107,585) (1,138,843)
Securities available for sale, 12 months or more, fair value 67,246,086 71,569,641
Securities available for sale, 12 months or more, gross unrealized losses (2,761,523) (1,761,568)
Securities available for sale, fair value 227,837,916 200,226,550
Securities available for sale, gross unrealized losses (6,869,108) (2,900,411)
US States and Political Subdivisions Debt Securities [Member]    
Securities held to maturity, less than 12 months, fair value 69,404,232 23,750,826
Securities held to maturity, less than 12 months, gross unrealized losses (2,881,032) (354,460)
Securities held to maturity, 12 months or more, fair value 59,545,239 72,611,780
Securities held to maturity, 12 months or more, gross unrealized losses (2,143,665) (2,133,659)
Securities held to maturity, fair value 128,949,471 96,362,606
Securities held to maturity, gross unrealized losses (5,024,697) (2,488,119)
Securities available for sale, less than 12 months, fair value 36,845,821 10,229,337
Securities available for sale, less than 12 months, gross unrealized losses (659,492) (41,151)
Securities available for sale, 12 months or more, fair value 8,217,318 9,997,433
Securities available for sale, 12 months or more, gross unrealized losses (239,952) (169,949)
Securities available for sale, fair value 45,063,139 20,226,770
Securities available for sale, gross unrealized losses (899,444) (211,100)
Other Securities [Member]    
Securities held to maturity, less than 12 months, fair value 1,038,825  
Securities held to maturity, less than 12 months, gross unrealized losses (11,175)  
Securities held to maturity, 12 months or more, fair value  
Securities held to maturity, fair value 1,038,825  
Securities held to maturity, gross unrealized losses (11,175)  
Securities available for sale, less than 12 months, fair value   923,535
Securities available for sale, less than 12 months, gross unrealized losses   (25,815)
Securities available for sale, 12 months or more, fair value  
Securities available for sale, 12 months or more, gross unrealized losses  
Securities available for sale, fair value   923,535
Securities available for sale, gross unrealized losses   (25,815)
US Government Agencies Debt Securities [Member]    
Securities available for sale, less than 12 months, fair value 29,643,497 28,576,258
Securities available for sale, less than 12 months, gross unrealized losses (589,515) (200,022)
Securities available for sale, 12 months or more, fair value 3,634,609 3,640,477
Securities available for sale, 12 months or more, gross unrealized losses (155,365) (149,945)
Securities available for sale, fair value 33,278,106 32,216,735
Securities available for sale, gross unrealized losses (744,880) (349,967)
Residential Mortgage Backed Securities [Member]    
Securities available for sale, less than 12 months, fair value 94,102,512 88,927,779
Securities available for sale, less than 12 months, gross unrealized losses (2,858,578) (871,855)
Securities available for sale, 12 months or more, fair value 55,394,159 57,931,731
Securities available for sale, 12 months or more, gross unrealized losses (2,366,206) (1,441,674)
Securities available for sale, fair value 149,496,671 146,859,510
Securities available for sale, gross unrealized losses $ (5,224,784) $ (2,313,529)