Note 10 - Fair Value (Details) - Assets Measured at Fair Value on a Recurring Basis - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Securities available for sale:
Securities available for sale	$ 367,229,783	$ 451,659,630
Derivative instruments	1,223,973	1,487,386
Securities available for sale including derivative instruments	368,453,756	453,147,016
Assets measured on a non-recurring basis	17,416,902	26,256,409
Impaired Loans/Leases [Member]
Securities available for sale:
Assets measured on a non-recurring basis	4,508,716	12,467,362
Other Real Estate Owned [Member]
Securities available for sale:
Assets measured on a non-recurring basis	12,908,186	13,789,047
US Government Agencies Debt Securities [Member]
Securities available for sale:
Securities available for sale	256,443,661	307,869,572
Residential Mortgage Backed Securities [Member]
Securities available for sale:
Securities available for sale	80,843,822	111,423,224
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale:
Securities available for sale	27,903,703	30,399,981
Other Securities [Member]
Securities available for sale:
Securities available for sale	2,038,597	1,966,853
Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale including derivative instruments	370,983	345,952
Fair Value, Inputs, Level 1 [Member] | Other Securities [Member]
Securities available for sale:
Securities available for sale	370,983	345,952
Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Derivative instruments	1,223,973	1,487,386
Securities available for sale including derivative instruments	368,082,773	452,801,064
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]
Securities available for sale:
Securities available for sale	256,443,661	307,869,572
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Securities available for sale:
Securities available for sale	80,843,822	111,423,224
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities available for sale:
Securities available for sale	27,903,703	30,399,981
Fair Value, Inputs, Level 2 [Member] | Other Securities [Member]
Securities available for sale:
Securities available for sale	1,667,614	1,620,901
Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Assets measured on a non-recurring basis	17,416,902	26,256,409
Fair Value, Inputs, Level 3 [Member] | Impaired Loans/Leases [Member]
Securities available for sale:
Assets measured on a non-recurring basis	4,508,716	12,467,362
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Securities available for sale:
Assets measured on a non-recurring basis	$ 12,908,186	$ 13,789,047