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Note 3 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Securities available for sale:    
Securities available for sale, less than 12 months, fair value $ 155,478,459 $ 35,844,695
Securities available for sale, less than 12 months, gross unrealized losses (2,160,027) (115,453)
Securities available for sale, 12 months or more, fair value 85,161,627 297,739,167
Securities available for sale, 12 months or more, gross unrealized losses (2,031,514) (5,752,770)
Securities available for sale, fair value 240,640,086 333,583,862
Securities available for sale, gross unrealized losses (4,191,541) (5,868,223)
US States and Political Subdivisions Debt Securities [Member]    
Securities held to maturity:    
Securities held to maturity, less than 12 months, fair value 14,803,408 20,419,052
Securities held to maturity, less than 12 months, gross unrealized losses (294,438) (587,992)
Securities held to maturity, 12 months or more, fair value 19,927,581 38,779,545
Securities held to maturity, 12 months or more, gross unrealized losses (878,994) (598,084)
Securities held to maturity, fair value 34,730,989 59,198,597
Securities held to maturity, gross unrealized losses (1,173,432) (1,186,076)
Securities available for sale:    
Securities available for sale, less than 12 months, fair value 2,220,800 920,935
Securities available for sale, less than 12 months, gross unrealized losses (31,807) (1,773)
Securities available for sale, 12 months or more, fair value 848,329 4,425,337
Securities available for sale, 12 months or more, gross unrealized losses (27,571) (60,699)
Securities available for sale, fair value 3,069,129 5,346,272
Securities available for sale, gross unrealized losses (59,378) (62,472)
US Government Agencies Debt Securities [Member]    
Securities available for sale:    
Securities available for sale, less than 12 months, fair value 112,900,327 23,970,085
Securities available for sale, less than 12 months, gross unrealized losses (1,397,591) (102,695)
Securities available for sale, 12 months or more, fair value 64,476,661 255,743,056
Securities available for sale, 12 months or more, gross unrealized losses (1,450,970) (5,161,178)
Securities available for sale, fair value 177,376,988 279,713,141
Securities available for sale, gross unrealized losses (2,848,561) (5,263,873)
Residential Mortgage Backed Securities [Member]    
Securities available for sale:    
Securities available for sale, less than 12 months, fair value 40,356,921 10,710,671
Securities available for sale, less than 12 months, gross unrealized losses (730,466) (10,139)
Securities available for sale, 12 months or more, fair value 19,836,637 37,570,774
Securities available for sale, 12 months or more, gross unrealized losses (552,973) (530,893)
Securities available for sale, fair value 60,193,558 48,281,445
Securities available for sale, gross unrealized losses (1,283,439) (541,032)
Other Securities [Member]    
Securities available for sale:    
Securities available for sale, less than 12 months, fair value 411 243,004
Securities available for sale, less than 12 months, gross unrealized losses (163) (846)
Securities available for sale, fair value 411 243,004
Securities available for sale, gross unrealized losses $ (163) $ (846)