Note 10 - Fair Value (Details) - Assets Measured at Fair Value on a Recurring Basis - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Securities available for sale:
Securities available for sale	$ 352,134,351	$ 451,659,630
Derivative instruments	784,655	1,487,386
Securities available for sale including derivative instruments	352,919,006	453,147,016
Securities available for sale:
Assets measured on a non-recurring basis	13,641,224	26,256,409
Impaired Loans/Leases [Member]
Securities available for sale:
Assets measured on a non-recurring basis	4,849,718	12,467,362
Other Real Estate Owned [Member]
Securities available for sale:
Assets measured on a non-recurring basis	8,791,506	13,789,047
US Government Agencies Debt Securities [Member]
Securities available for sale:
Securities available for sale	247,624,591	307,869,572
Residential Mortgage Backed Securities [Member]
Securities available for sale:
Securities available for sale	74,901,559	111,423,224
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale:
Securities available for sale	27,701,652	30,399,981
Other Securities [Member]
Securities available for sale:
Securities available for sale	1,906,549	1,966,853
Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale including derivative instruments	354,128	345,952
Fair Value, Inputs, Level 1 [Member] | Other Securities [Member]
Securities available for sale:
Securities available for sale	354,128	345,952
Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Derivative instruments	784,655	1,487,386
Securities available for sale including derivative instruments	352,564,878	452,801,064
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]
Securities available for sale:
Securities available for sale	247,624,591	307,869,572
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Securities available for sale:
Securities available for sale	74,901,559	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	27,701,652	30,399,981
Fair Value, Inputs, Level 2 [Member] | Other Securities [Member]
Securities available for sale:
Securities available for sale	1,552,421	1,620,901
Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Assets measured on a non-recurring basis	13,641,224	26,256,409
Fair Value, Inputs, Level 3 [Member] | Impaired Loans/Leases [Member]
Securities available for sale:
Assets measured on a non-recurring basis	4,849,718	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	$ 8,791,506	$ 13,789,047