Note 6 - Quantitative Information About Level Fair Value Measurements (Details) - USD ($)	6 Months Ended
Jun. 30, 2016	Dec. 31, 2015
Impaired Loans Leases [Member] \| Minimum [Member]
Appraisal adjustments	10.00%
Impaired Loans Leases [Member] \| Maximum [Member]
Appraisal adjustments	50.00%
Impaired Loans Leases [Member]
Fair value	$ 5,669,757	$ 4,545,966
Valuation technique	Appraisal of collateral
Other Securities [Member] \| Minimum [Member]
Appraisal adjustments	0.00%
Other Securities [Member] \| Maximum [Member]
Appraisal adjustments	35.00%
Other Securities [Member]
Fair value	$ 6,673,430	$ 7,722,711
Valuation technique	Appraisal of collateral

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueInputsComparabilityAdjustments
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=qcrh_OtherSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: