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Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Securities by Contractual Maturity - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Securities held to maturity:    
Due in one year or less $ 4,400,190  
Due in one year or less 4,406,723  
Due after one year through five years 16,813,102  
Due after one year through five years 16,900,556  
Due after five years 203,924,942  
Due after five years 202,233,902  
225,138,234  
223,541,181 $ 201,113,796
Securities available for sale:    
Due in one year or less 1,642,213  
Due in one year or less 1,648,864  
Due after one year through five years 117,746,437  
Due after one year through five years 117,089,821  
Due after five years 167,902,810  
Due after five years 165,608,679  
287,291,460  
284,347,364  
Amortized Cost 369,710,718  
Fair Value 367,229,783  
Residential Mortgage Backed Securities [Member]    
Securities available for sale:    
Amortized Cost 81,029,967  
Fair Value 80,843,822  
Other Securities [Member]    
Securities held to maturity:    
1,050,000 1,050,000
Securities available for sale:    
Amortized Cost 1,389,291  
Fair Value 2,038,597  
US States and Political Subdivisions Debt Securities [Member]    
Securities held to maturity:    
222,491,181 $ 200,063,796
Callable Securities [Member]    
Securities available for sale:    
Amortized Cost 188,302,526  
Fair Value 185,563,826  
Callable Securities [Member] | US States and Political Subdivisions Debt Securities [Member]    
Securities available for sale:    
Amortized Cost 16,797,862  
Fair Value 17,134,333  
Securities held to maturity:    
Municipal securities 126,157,613  
Municipal securities 125,222,912  
Callable Securities [Member] | US Government-sponsored Enterprises Debt Securities [Member]    
Securities available for sale:    
Amortized Cost 171,504,664  
Fair Value $ 168,429,493