Note 8 - Fair Value (Details) - Assets Measured at Fair Value on a Recurring Basis (USD $)	Jun. 30, 2013	Dec. 31, 2012
Securities available for sale:
Securities available for sale	$ 598,265,400	$ 530,159,986
US Government Agencies Debt Securities [Member] | Estimate of Fair Value Measurement [Member]
Securities available for sale:
Securities available for sale	380,915,891	338,609,371
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale	0	0
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	380,915,891	338,609,371
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Securities available for sale	0	0
Residential Mortgage Backed Securities [Member] | Estimate of Fair Value Measurement [Member]
Securities available for sale:
Securities available for sale	178,545,554	163,601,103
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale	0	0
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	178,545,554	163,601,103
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Securities available for sale	0	0
Residential Mortgage Backed Securities [Member]
Securities available for sale:
Securities available for sale	178,545,554	163,601,103
US States and Political Subdivisions Debt Securities [Member] | Estimate of Fair Value Measurement [Member]
Securities available for sale:
Securities available for sale	36,828,850	26,185,736
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale	0	0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	36,828,850	26,185,736
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Securities available for sale	0	0
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale:
Securities available for sale	36,828,850	26,185,736
Trust preferred securities [Member] | Estimate of Fair Value Measurement [Member]
Securities available for sale:
Securities available for sale	216,200	139,400
Trust preferred securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale	0	0
Trust preferred securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	216,200	139,400
Trust preferred securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Securities available for sale	0	0
Trust preferred securities [Member]
Securities available for sale:
Securities available for sale	216,200	139,400
Equity Securities, Other [Member] | Estimate of Fair Value Measurement [Member]
Securities available for sale:
Securities available for sale	1,758,905	1,624,376
Equity Securities, Other [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale	264,869	234,453
Equity Securities, Other [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	1,494,036	1,389,923
Equity Securities, Other [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Securities available for sale	0	0
Equity Securities, Other [Member]
Securities available for sale:
Securities available for sale	1,758,905	1,624,376
Impaired Loans/Leases [Member] | Estimate of Fair Value Measurement [Member]
Securities available for sale:
Assets measured on a non-recurring basis	16,005,797	18,054,234
Impaired Loans/Leases [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Assets measured on a non-recurring basis	0	0
Impaired Loans/Leases [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Assets measured on a non-recurring basis	0	0
Impaired Loans/Leases [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Assets measured on a non-recurring basis	16,005,797	18,054,234
Other Real Estate Owned [Member] | Estimate of Fair Value Measurement [Member]
Securities available for sale:
Assets measured on a non-recurring basis	4,167,319	4,270,901
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Assets measured on a non-recurring basis	0	0
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Assets measured on a non-recurring basis	0	0
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Assets measured on a non-recurring basis	4,167,319	4,270,901
Estimate of Fair Value Measurement [Member]
Securities available for sale:
Securities available for sale	598,265,400	530,159,986
Assets measured on a non-recurring basis	20,173,116	22,325,135
Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale	264,869	234,453
Assets measured on a non-recurring basis	0	0
Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	598,000,531	529,925,533
Assets measured on a non-recurring basis	0	0
Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Securities available for sale	0	0
Assets measured on a non-recurring basis	$ 20,173,116	$ 22,325,135