Note 6 - Fair Value (Details) - Assets Measured at Fair Value on a Recurring Basis (USD $)	Mar. 31, 2014	Dec. 31, 2013
Securities available for sale:
Securities available for sale	$ 545,477,537	$ 551,758,458
Assets measured on a non-recurring basis	17,972,804	19,516,934
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	350,337,559	356,472,987
US Government Agencies Debt Securities [Member]
Securities available for sale:
Securities available for sale	350,337,559	356,472,987
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	158,119,401	157,429,451
Residential Mortgage Backed Securities [Member]
Securities available for sale:
Securities available for sale	158,119,401	157,429,451
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	35,076,066	35,958,857
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale:
Securities available for sale	35,076,066	35,958,857
Equity Securities, Other [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale	317,137	317,698
Equity Securities, Other [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	1,627,374	1,579,465
Equity Securities, Other [Member]
Securities available for sale:
Securities available for sale	1,944,511	1,897,163
Impaired Loans/Leases [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Assets measured on a non-recurring basis	7,524,198	9,009,557
Impaired Loans/Leases [Member]
Securities available for sale:
Assets measured on a non-recurring basis	7,524,198	9,009,557
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Assets measured on a non-recurring basis	10,448,606	10,507,377
Other Real Estate Owned [Member]
Securities available for sale:
Assets measured on a non-recurring basis	10,448,606	10,507,377
Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale	317,137	317,698
Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	545,160,400	551,440,760
Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Assets measured on a non-recurring basis	$ 17,972,804	$ 19,516,934