Note 3 - Loans Leases Receivable - Aging of the Loan Lease Portfolio (Details) - USD ($)		Sep. 30, 2017	Dec. 31, 2016
Current		$ 2,643,166,024	$ 2,378,270,983
Accruing Past Due 90 Days or More		422,880	966,814
Financing Receivable, Recorded Investment, Nonaccrual Status		20,443,137	13,919,066
Loans and Leases Receivable, Net of Deferred Income		$ 2,669,013,113	$ 2,397,414,282
Current as a percentage of total loan/lease portfolio		99.03%	99.20%
Accruing past due 90 days or more as a percentage of total loan/lease portfolio		0.02%	0.04%
Nonaccrual Loans/Leases as a percentage of total loan/lease portfolio		0.77%	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		$ 3,332,998	$ 3,000,574
Past due as a percentage of total loan/lease portfolio		0.12%	0.13%
Financing Receivables, 60 to 89 Days Past Due [Member]
Past Due		$ 1,648,074	$ 1,256,845
Past due as a percentage of total loan/lease portfolio		0.06%	0.05%
Commercial Portfolio Segment [Member]
Current		$ 1,031,800,612	$ 821,637,507
Accruing Past Due 90 Days or More		12,892	346,234
Financing Receivable, Recorded Investment, Nonaccrual Status		1,567,813	4,187,786	[1]
Loans and Leases Receivable, Net of Deferred Income	[2]	1,034,530,786	827,637,263
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past Due		1,149,469	1,455,185
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past Due			10,551
Commercial Real Estate Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income		1,157,855,663	1,093,458,860
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Current		326,879,997	331,812,571
Accruing Past Due 90 Days or More
Financing Receivable, Recorded Investment, Nonaccrual Status		155,020	332,148	[1]
Loans and Leases Receivable, Net of Deferred Income		327,144,766	332,387,621
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Current		164,647,962	160,760,034
Accruing Past Due 90 Days or More
Financing Receivable, Recorded Investment, Nonaccrual Status		4,344,742	4,353,819	[1]
Loans and Leases Receivable, Net of Deferred Income		168,992,704	165,149,491
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Current		650,410,884	594,384,926
Accruing Past Due 90 Days or More
Financing Receivable, Recorded Investment, Nonaccrual Status		10,981,845	1,436,149	[1]
Loans and Leases Receivable, Net of Deferred Income		661,718,193	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		109,749
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		325,464	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		142,413,187	161,452,627
Accruing Past Due 90 Days or More			215,225
Financing Receivable, Recorded Investment, Nonaccrual Status		2,238,372	2,446,181	[1]
Loans and Leases Receivable, Net of Deferred Income	[3],[4]	147,062,893	165,419,360
Finance Leases Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past Due		1,558,490	730,627
Finance Leases Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past Due		852,844	574,700
Residential Portfolio Segment [Member]
Current		237,860,369	227,023,552
Accruing Past Due 90 Days or More		307,676	294,854
Financing Receivable, Recorded Investment, Nonaccrual Status		917,857	1,075,639	[1]
Loans and Leases Receivable, Net of Deferred Income	[4],[5]	239,957,916	229,233,104
Residential Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past Due		116,095	473,478
Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past Due		755,919	365,581
Consumer Portfolio Segment [Member]
Current		89,153,013	81,199,766
Accruing Past Due 90 Days or More		102,312	110,501
Financing Receivable, Recorded Investment, Nonaccrual Status		237,488	87,344	[1]
Loans and Leases Receivable, Net of Deferred Income	[4]	89,605,855	81,665,695
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past Due		73,731	204,973
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past Due		$ 39,311	$ 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] Includes loans outstanding at QCBT's wholly-owned subsidiary, m2, totaling $60,981,381 and $38,668,209 as of September 30, 2017 and December 31, 2016, respectively.

[3] 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 and nine months ended September 30, 2017 and 2016.

[4] 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.

[5] Includes residential real estate loans held for sale totaling $290,320 and $1,135,500 as of September 30, 2017, and December 31, 2016, respectively.