Note 6 - Fair Value (Details) - Assets Measured at Fair Value on a Recurring Basis (USD $)	Sep. 30, 2014	Dec. 31, 2013
Securities available for sale:
Available for sale securities	$ 466,944,567	$ 551,758,458
Assets measured on a non-recurring basis	25,150,866	19,516,934
Derivative instruments	1,848,119
	468,792,686
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Available for sale securities	306,004,605	356,472,987
US Government Agencies Debt Securities [Member]
Securities available for sale:
Available for sale securities	306,004,605	356,472,987
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Available for sale securities	127,779,749	157,429,451
Residential Mortgage Backed Securities [Member]
Securities available for sale:
Available for sale securities	127,779,749	157,429,451
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Available for sale securities	31,260,146	35,958,857
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale:
Available for sale securities	31,260,146	35,958,857
Equity Securities, Other [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Available for sale securities	317,021	317,698
Equity Securities, Other [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Available for sale securities	1,583,046	1,579,465
Equity Securities, Other [Member]
Securities available for sale:
Available for sale securities	1,900,067	1,897,163
Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Available for sale securities		317,698
	317,021
Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Available for sale securities		551,440,760
Derivative instruments	1,848,119
	468,475,665
Fair Value, Inputs, Level 3 [Member] | Impaired Loans/Leases [Member]
Securities available for sale:
Assets measured on a non-recurring basis	13,616,631	9,009,557
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Securities available for sale:
Assets measured on a non-recurring basis	11,534,235	10,507,377
Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Assets measured on a non-recurring basis	25,150,866	19,516,934
Impaired Loans/Leases [Member]
Securities available for sale:
Assets measured on a non-recurring basis	13,616,631	9,009,557
Other Real Estate Owned [Member]
Securities available for sale:
Assets measured on a non-recurring basis	$ 11,534,235	$ 10,507,377