Note 3 - Loans Leases Receivable - Aging of the Loan Lease Portfolio (Details) - USD ($)		Mar. 31, 2017	Dec. 31, 2016
Current		$ 2,407,681,867	$ 2,378,270,983
Accruing Past Due 90 Days or More		954,924	966,814
Financing Receivable, Recorded Investment, Nonaccrual Status		14,205,302	13,919,066
Loans		$ 2,427,885,239	$ 2,397,414,282
Current as a percentage of total loan/lease portfolio		99.17%	99.20%
Accruing past due 90 days or more as a percentage of total loan/lease portfolio		0.04%	0.04%
Nonaccrual Loans/Leases as a percentage of total loan/lease portfolio		0.59%	0.58%
Loans and leases as a percentage of total loan/lease portfolio		100.00%	100.00%
Financing Receivables, 30 to 59 Days Past Due [Member]
Past Due		$ 4,152,821	$ 3,000,574
Past due as a percentage of total loan/lease portfolio		0.17%	0.13%
Financing Receivables, 60 to 89 Days Past Due [Member]
Past Due		$ 890,325	$ 1,256,845
Past due as a percentage of total loan/lease portfolio		0.04%	0.05%
Commercial Portfolio Segment [Member]
Current		$ 846,264,365	$ 821,637,507
Accruing Past Due 90 Days or More		575,066	346,234
Financing Receivable, Recorded Investment, Nonaccrual Status		4,464,937	4,187,786	[1]
Loans		851,578,347	827,637,263
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past Due		108,148	1,455,185
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past Due		165,831	10,551
Commercial Real Estate Portfolio Segment [Member]
Loans		1,106,841,721	1,093,458,860
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Current		316,508,674	331,812,571
Accruing Past Due 90 Days or More		240
Financing Receivable, Recorded Investment, Nonaccrual Status		332,148	332,148	[1]
Loans		316,902,218	332,387,621
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Current		167,552,441	160,760,034
Accruing Past Due 90 Days or More
Financing Receivable, Recorded Investment, Nonaccrual Status		4,349,267	4,353,819	[1]
Loans		171,901,708	165,149,491
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Current		616,480,649	594,384,926
Accruing Past Due 90 Days or More
Financing Receivable, Recorded Investment, Nonaccrual Status		1,252,646	1,436,149	[1]
Loans		618,037,795	595,921,748
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Past Due		61,156
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Construction Loans [Member]
Past Due			35,638
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Past Due		304,500	100,673
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Past Due			242,902
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Construction Loans [Member]
Past Due
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Past Due
Finance Leases Portfolio Segment [Member]
Current		154,874,086	161,452,627
Accruing Past Due 90 Days or More			215,225
Financing Receivable, Recorded Investment, Nonaccrual Status		2,399,232	2,446,181	[1]
Loans	[2],[3]	159,368,425	165,419,360
Finance Leases Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past Due		1,428,446	730,627
Finance Leases Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past Due		666,661	574,700
Residential Portfolio Segment [Member]
Current		228,282,091	227,023,552
Accruing Past Due 90 Days or More		255,942	294,854
Financing Receivable, Recorded Investment, Nonaccrual Status		1,199,921	1,075,639	[1]
Loans	[3],[4]	231,325,899	229,233,104
Residential Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past Due		1,587,945	473,478
Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past Due			365,581
Consumer Portfolio Segment [Member]
Current		77,719,561	81,199,766
Accruing Past Due 90 Days or More		123,676	110,501
Financing Receivable, Recorded Investment, Nonaccrual Status		207,151	87,344	[1]
Loans	[3]	78,770,847	81,665,695
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past Due		662,626	204,973
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past Due		$ 57,833	$ 63,111

[1] Nonaccrual loans/leases included $2,300,479 of TDRs, including $48,501 in C&I loans, $1,380,047 in CRE loans, $816,149 in direct financing leases, $43,579 in residential real estate loans, and $12,203 in installment loans.

[2] Management performs an evaluation of the estimated unguaranteed residual values of leased assets on an annual basis, at a minimum. The evaluation consists of discussions with reputable and current vendors, which is combined with management's expertise and understanding of the current states of particular industries to determine informal valuations of the equipment. As necessary and where available, management will utilize valuations by independent appraisers. The large majority of leases with residual values contain a lease options rider, which requires the lessee to pay the residual value directly, finance the payment of the residual value, or extend the lease term to pay the residual value. In these cases, the residual value is protected and the risk of loss is minimal. There were no losses related to residual values for the three months ended March 31, 2017 and 2016.

[3] Performing = loans/leases accruing and less than 90 days past due. Nonperforming = loans/leases on nonaccrual, accruing loans/leases that are greater than or equal to 90 days past due, and accruing TDRs.

[4] Includes residential real estate loans held for sale totaling $1,051,000 and $1,135,500 as of March 31, 2017, and December 31, 2016, respectively.