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Note 9 - Short-term Borrowings - Overnight Repurchase Agreement Collateralized Investment Securities (Details) - Securities Sold under Agreements to Repurchase [Member] - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Securities sold under repurchase agreements	$ 20,893,982	$ 19,720,338
Less: overcollateralized position	13,890,860	11,588,951
	7,003,122	8,131,387
US Government Agencies Debt Securities [Member]
Securities sold under repurchase agreements	2,077,702	630,077
Residential Mortgage Backed Securities [Member]
Securities sold under repurchase agreements	$ 18,816,280	$ 19,090,261

X

- Definition

Amount of overcapitalized position that is intend to cover any minor interest rate movement.

+ References

No definition available.

+ Details

Name:	qcrh_OvercollateralizedPosition
Namespace Prefix:	qcrh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Carrying amount of assets sold under agreements to repurchase when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under repurchase agreements exceeds 10 percent of total assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(m)(1)(i)(A)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

X

- Definition

Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Namespace Prefix:	us-gaap_
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Period Type:	instant

X

- Details

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

X

- Details

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Namespace Prefix:
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- Details

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