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Note 2 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Securities available for sale:    
Securities available for sale, less than 12 months, fair value $ 174,668,810 $ 35,844,695
Securities available for sale, less than 12 months, gross unrealized losses (2,389,486) (115,453)
Securities available for sale, 12 months or more, fair value 110,544,633 297,739,167
Securities available for sale, 12 months or more, gross unrealized losses (2,718,000) (5,752,770)
Securities available for sale, fair value 285,213,443 333,583,862
Securities available for sale, gross unrealized losses (5,107,486) (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 76,375,019 20,419,052
Securities held to maturity, less than 12 months, gross unrealized losses (2,218,961) (587,992)
Securities held to maturity, 12 months or more, fair value 34,698,604 38,779,545
Securities held to maturity, 12 months or more, gross unrealized losses (954,308) (598,084)
Securities held to maturity, fair value 111,073,623 59,198,597
Securities held to maturity, gross unrealized losses (3,173,269) (1,186,076)
Securities available for sale:    
Securities available for sale, less than 12 months, fair value 4,417,658 920,935
Securities available for sale, less than 12 months, gross unrealized losses (49,532) (1,773)
Securities available for sale, 12 months or more, fair value 1,322,180 4,425,337
Securities available for sale, 12 months or more, gross unrealized losses (52,583) (60,699)
Securities available for sale, fair value 5,739,838 5,346,272
Securities available for sale, gross unrealized losses (102,115) (62,472)
US Government Agencies Debt Securities [Member]    
Securities available for sale:    
Securities available for sale, less than 12 months, fair value 138,963,817 23,970,085
Securities available for sale, less than 12 months, gross unrealized losses (1,920,958) (102,695)
Securities available for sale, 12 months or more, fair value 87,910,053 255,743,056
Securities available for sale, 12 months or more, gross unrealized losses (1,999,568) (5,161,178)
Securities available for sale, fair value 226,873,870 279,713,141
Securities available for sale, gross unrealized losses (3,920,526) (5,263,873)
Residential Mortgage Backed Securities [Member]    
Securities available for sale:    
Securities available for sale, less than 12 months, fair value 31,047,920 10,710,671
Securities available for sale, less than 12 months, gross unrealized losses (413,983) (10,139)
Securities available for sale, 12 months or more, fair value 21,312,400 37,570,774
Securities available for sale, 12 months or more, gross unrealized losses (665,849) (530,893)
Securities available for sale, fair value 52,360,320 48,281,445
Securities available for sale, gross unrealized losses (1,079,832) (541,032)
Other Securities [Member]    
Securities available for sale:    
Securities available for sale, less than 12 months, fair value 239,415 243,004
Securities available for sale, less than 12 months, gross unrealized losses (5,013) (846)
Securities available for sale, fair value 239,415 243,004
Securities available for sale, gross unrealized losses $ (5,013) $ (846)