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Note 2 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Securities available for sale:    
Securities available for sale, less than 12 months, fair value $ 74,672,453 $ 35,844,695
Securities available for sale, less than 12 months, gross unrealized losses (438,531) (115,453)
Securities available for sale, 12 months or more, fair value 95,873,575 297,739,167
Securities available for sale, 12 months or more, gross unrealized losses (1,019,352) (5,752,770)
Securities available for sale, fair value 170,546,028 333,583,862
Securities available for sale, gross unrealized losses (1,457,883) (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 53,289,140 20,419,052
Securities held to maturity, less than 12 months, gross unrealized losses (1,053,551) (587,992)
Securities held to maturity, 12 months or more, fair value 15,450,731 38,779,545
Securities held to maturity, 12 months or more, gross unrealized losses (596,104) (598,084)
Securities held to maturity, fair value 68,739,871 59,198,597
Securities held to maturity, gross unrealized losses (1,649,655) (1,186,076)
Securities available for sale:    
Securities available for sale, less than 12 months, fair value 1,621,304 920,935
Securities available for sale, less than 12 months, gross unrealized losses (11,388) (1,773)
Securities available for sale, 12 months or more, fair value 852,734 4,425,337
Securities available for sale, 12 months or more, gross unrealized losses (28,057) (60,699)
Securities available for sale, fair value 2,474,038 5,346,272
Securities available for sale, gross unrealized losses (39,445) (62,472)
US Government Agencies Debt Securities [Member]    
Securities available for sale:    
Securities available for sale, less than 12 months, fair value 54,246,955 23,970,085
Securities available for sale, less than 12 months, gross unrealized losses (229,249) (102,695)
Securities available for sale, 12 months or more, fair value 74,289,108 255,743,056
Securities available for sale, 12 months or more, gross unrealized losses (635,765) (5,161,178)
Securities available for sale, fair value 128,536,063 279,713,141
Securities available for sale, gross unrealized losses (865,014) (5,263,873)
Residential Mortgage Backed Securities [Member]    
Securities available for sale:    
Securities available for sale, less than 12 months, fair value 18,732,443 10,710,671
Securities available for sale, less than 12 months, gross unrealized losses (126,214) (10,139)
Securities available for sale, 12 months or more, fair value 20,731,733 37,570,774
Securities available for sale, 12 months or more, gross unrealized losses (355,530) (530,893)
Securities available for sale, fair value 39,464,176 48,281,445
Securities available for sale, gross unrealized losses (481,744) (541,032)
Other Securities [Member]    
Securities available for sale:    
Securities available for sale, less than 12 months, fair value 71,751 243,004
Securities available for sale, less than 12 months, gross unrealized losses (71,680) (846)
Securities available for sale, fair value 71,751 243,004
Securities available for sale, gross unrealized losses $ (71,680) $ (846)