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Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Securities by Contractual Maturity - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Securities held to maturity:    
Due in one year or less $ 4,206,670  
Due in one year or less 4,213,609  
Due after one year through five years 20,737,843  
Due after one year through five years 20,889,363  
Due after five years 236,185,073  
Due after five years 239,311,750  
261,129,586  
264,414,722 $ 255,691,285
Securities available for sale:    
Due in one year or less 1,884,460  
Due in one year or less 1,895,137  
Due after one year through five years 68,198,829  
Due after one year through five years 69,027,450  
Due after five years 86,111,221  
Due after five years 86,748,890  
156,194,510  
157,671,477  
Amortized Cost 273,844,647  
Fair Value 276,187,867  
Securities held to maturity:    
Amortized Cost 81,304,783  
Fair Value 81,704,514  
Residential Mortgage Backed Securities [Member]    
Securities available for sale:    
Amortized Cost 116,012,771  
Fair Value 116,452,374  
Other Securities [Member]    
Securities held to maturity:    
1,050,000 1,050,000
Securities available for sale:    
Amortized Cost 1,637,366  
Fair Value 2,064,016  
US States and Political Subdivisions Debt Securities [Member]    
Securities held to maturity:    
263,364,722 $ 254,641,285
Callable Securities [Member] | US States and Political Subdivisions Debt Securities [Member]    
Securities held to maturity:    
Amortized Cost 15,335,099  
Fair Value 15,728,025  
Callable Securities [Member] | US Government-sponsored Enterprises Debt Securities [Member]    
Securities held to maturity:    
Amortized Cost 65,969,684  
Fair Value 65,976,489  
Callable Securities [Member] | US States and Political Subdivisions Debt Securities [Member]    
Securities held to maturity:    
Amortized Cost 135,926,431  
Fair Value $ 137,921,557