Note 4 - Loans Leases Receivable - Troubled Debt Restructurings (Details)	12 Months Ended
Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Number of Loans / Leases	29	2
Pre-Modification Recorded Investment	$ 7,880,881	$ 37,979
Post-Modification Recorded Investment	7,880,881	37,979
Specific Allowance	$ 1,225,716	$ 12,013
Extended Maturity [Member]
Number of Loans / Leases	8
Pre-Modification Recorded Investment	$ 935,221
Post-Modification Recorded Investment	935,221
Specific Allowance	$ 286,735
Interest Rate Below Market Reduction [Member]
Number of Loans / Leases	1	2
Pre-Modification Recorded Investment	$ 1,233,740	$ 37,979
Post-Modification Recorded Investment	$ 1,233,740	37,979
Specific Allowance		$ 12,013
Payment Deferral [Member]
Number of Loans / Leases	20
Pre-Modification Recorded Investment	$ 5,711,920
Post-Modification Recorded Investment	5,711,920
Specific Allowance	$ 938,981
Commercial Portfolio Segment [Member] \| Extended Maturity [Member]
Number of Loans / Leases	3
Pre-Modification Recorded Investment	$ 247,476
Post-Modification Recorded Investment	247,476
Specific Allowance	$ 60,767
Commercial Portfolio Segment [Member] \| Payment Deferral [Member]
Number of Loans / Leases	7
Pre-Modification Recorded Investment	$ 4,562,427
Post-Modification Recorded Investment	4,562,427
Specific Allowance	$ 813,041
Consumer Portfolio Segment [Member] \| Interest Rate Below Market Reduction [Member]
Number of Loans / Leases		2
Pre-Modification Recorded Investment		$ 37,979
Post-Modification Recorded Investment		37,979
Specific Allowance		$ 12,013
Finance Leases Portfolio Segment [Member] \| Extended Maturity [Member]
Number of Loans / Leases	4
Pre-Modification Recorded Investment	$ 410,653
Post-Modification Recorded Investment	410,653
Specific Allowance	$ 38,476
Finance Leases Portfolio Segment [Member] \| Payment Deferral [Member]
Number of Loans / Leases	13
Pre-Modification Recorded Investment	$ 1,149,493
Post-Modification Recorded Investment	1,149,493
Specific Allowance	$ 125,940
Residential Portfolio Segment [Member] \| Extended Maturity [Member]
Number of Loans / Leases	1
Pre-Modification Recorded Investment	$ 277,092
Post-Modification Recorded Investment	277,092
Specific Allowance	$ 187,492
Commercial Real Estate Portfolio Segment [Member] \| Interest Rate Below Market Reduction [Member]
Number of Loans / Leases	1
Pre-Modification Recorded Investment	$ 1,233,740
Post-Modification Recorded Investment	$ 1,233,740

Specific allowance of amount of investment in financing receivables modified by troubled debt restructurings.

No definition available.

Name:	qcrh_FinancingReceivableModificationsSpecificAllowanceRecordedInvestment
Namespace Prefix:	qcrh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_InterestRateBelowMarketReductionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_PaymentDeferralMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_FinanceLeasesPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: