Note 11 - Junior Subordinated Debentures (Details) - Trust Preferred Securities - USD ($)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Investments in and Advances to Affiliates [Line Items]
Amount Outstanding (in Dollars)		$ 40,725,000
Interest Rate, Basis Spread		3.10%
Interest Rate		2.60%	2.50%
Trust Preferred Securities [Member] | QCR Holdings Statuory Trust II [Member]
Investments in and Advances to Affiliates [Line Items]
Date issued	[1]	February 2004
Amount Outstanding (in Dollars)	[1]	$ 10,310,000
Interest Rate	[1]	3.18%	3.08%
Trust Preferred Securities [Member] | QCR Holdings Statutory Trust III [Member]
Investments in and Advances to Affiliates [Line Items]
Date issued		February 2004
Amount Outstanding (in Dollars)		$ 8,248,000
Interest Rate		3.18%	3.08%
Trust Preferred Securities [Member] | QCR Holdings Statutory Trust IV [Member]
Investments in and Advances to Affiliates [Line Items]
Date issued		May 2005
Amount Outstanding (in Dollars)		$ 5,155,000
Interest Rate		2.12%	2.03%
Trust Preferred Securities [Member] | QCR Holdings Statutory Trust V [Member]
Investments in and Advances to Affiliates [Line Items]
Date issued		February 2006
Amount Outstanding (in Dollars)		$ 10,310,000
Interest Rate		1.87%	1.78%
Trust Preferred Securities [Member] | Community National Statutory Trust II [Member]
Investments in and Advances to Affiliates [Line Items]
Date issued		September 2004
Amount Outstanding (in Dollars)		$ 3,093,000
Interest Rate		2.74%	2.42%
Trust Preferred Securities [Member] | Community National Statutory Trust III [Member]
Investments in and Advances to Affiliates [Line Items]
Date issued		March 2007
Amount Outstanding (in Dollars)		$ 3,609,000
Interest Rate		2.26%	1.99%
Trust Preferred Securities [Member] | London Interbank Offered Rate (LIBOR) [Member] | QCR Holdings Statuory Trust II [Member]
Investments in and Advances to Affiliates [Line Items]
Interest Rate, Basis Spread		2.85%
Trust Preferred Securities [Member] | London Interbank Offered Rate (LIBOR) [Member] | QCR Holdings Statutory Trust III [Member]
Investments in and Advances to Affiliates [Line Items]
Interest Rate, Basis Spread		2.85%
Trust Preferred Securities [Member] | London Interbank Offered Rate (LIBOR) [Member] | QCR Holdings Statutory Trust IV [Member]
Investments in and Advances to Affiliates [Line Items]
Interest Rate, Basis Spread		1.80%
Trust Preferred Securities [Member] | London Interbank Offered Rate (LIBOR) [Member] | QCR Holdings Statutory Trust V [Member]
Investments in and Advances to Affiliates [Line Items]
Interest Rate, Basis Spread		1.55%
Trust Preferred Securities [Member] | London Interbank Offered Rate (LIBOR) [Member] | Community National Statutory Trust II [Member]
Investments in and Advances to Affiliates [Line Items]
Interest Rate, Basis Spread		2.17%
Trust Preferred Securities [Member] | London Interbank Offered Rate (LIBOR) [Member] | Community National Statutory Trust III [Member]
Investments in and Advances to Affiliates [Line Items]
Interest Rate, Basis Spread		1.75%

[1] Original amount issued for QCR Holdings Statutory Trust II was $12,372,000.