Note 14 - Junior Subordinated Debentures - Trust Preferred Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Aggregate principal amount	$ 50,520	$ 50,520
Interest rate (as a percent)	7.70%	6.29%
Qcr Holdings Statutory Trust I I Member
Date issued	February 2004
Aggregate principal amount	$ 10,310	$ 10,310
Interest rate (as a percent)	8.44%	6.52%
Qcr Holdings Statutory Trust I I Member | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Variable interest rate (as a percent)	2.85%
QCR Holdings Statutory Trust III [Member]
Date issued	February 2004
Aggregate principal amount	$ 8,248	$ 8,248
Interest rate (as a percent)	8.44%	6.52%
QCR Holdings Statutory Trust III [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Variable interest rate (as a percent)	2.85%
QCR Holdings Statutory Trust V [Member]
Date issued	February 2006
Aggregate principal amount	$ 10,310	$ 10,310
Interest rate (as a percent)	7.21%	5.63%
QCR Holdings Statutory Trust V [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Variable interest rate (as a percent)	1.55%
Community National Statutory Trust II [Member]
Date issued	September 2004
Aggregate principal amount	$ 3,093	$ 3,093
Interest rate (as a percent)	7.80%	6.92%
Community National Statutory Trust II [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Variable interest rate (as a percent)	2.17%
Community National Statutory Trust III [Member]
Date issued	March 2007
Aggregate principal amount	$ 3,609	$ 3,609
Interest rate (as a percent)	7.40%	6.52%
Community National Statutory Trust III [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Variable interest rate (as a percent)	1.75%
Guaranty Bankshares Statutory Trust I [Member]
Date issued	May 2005
Aggregate principal amount	$ 4,640	$ 4,640
Interest rate (as a percent)	7.40%	6.52%
Guaranty Bankshares Statutory Trust I [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Variable interest rate (as a percent)	1.75%
Guaranty Federal Statutory Trust II [Member]
Date issued	December 2005
Aggregate principal amount	$ 10,310	$ 10,310
Interest rate (as a percent)	7.09%	6.14%
Guaranty Federal Statutory Trust II [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Variable interest rate (as a percent)	1.45%