Note 13 - Junior Subordinated Debentures - Trust Preferred Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Aggregate principal amount	$ 50,520	$ 40,210
Interest rate (as a percent)	6.29%	2.43%
Guaranty Bankshares Statutory Trust I [Member]
Date issued	May 2005
Aggregate principal amount	$ 4,640	$ 4,640
Interest rate (as a percent)	6.52%	1.95%
Trust Preferred Securities [Member] | Qcr Holdings Statutory Trust I I Member
Date issued	February 2004
Aggregate principal amount	$ 10,310	$ 10,310
Interest rate (as a percent)	6.52%	3.07%
Trust Preferred Securities [Member] | Qcr Holdings Statutory Trust I I Member | London Interbank Offered Rate (LIBOR)
Variable interest rate (as a percent)	2.85%
Trust Preferred Securities [Member] | QCR Holdings Statutory Trust III [Member]
Date issued	February 2004
Aggregate principal amount	$ 8,248	$ 8,248
Interest rate (as a percent)	6.52%	3.07%
Trust Preferred Securities [Member] | QCR Holdings Statutory Trust III [Member] | London Interbank Offered Rate (LIBOR)
Variable interest rate (as a percent)	2.85%
Trust Preferred Securities [Member] | QCR Holdings Statutory Trust V [Member]
Date issued	February 2006
Aggregate principal amount	$ 10,310	$ 10,310
Interest rate (as a percent)	5.63%	1.67%
Trust Preferred Securities [Member] | QCR Holdings Statutory Trust V [Member] | London Interbank Offered Rate (LIBOR)
Variable interest rate (as a percent)	1.55%
Trust Preferred Securities [Member] | Community National Statutory Trust II [Member]
Date issued	September 2004
Aggregate principal amount	$ 3,093	$ 3,093
Interest rate (as a percent)	6.92%	2.38%
Trust Preferred Securities [Member] | Community National Statutory Trust II [Member] | London Interbank Offered Rate (LIBOR)
Variable interest rate (as a percent)	2.17%
Trust Preferred Securities [Member] | Community National Statutory Trust III [Member]
Date issued	March 2007
Aggregate principal amount	$ 3,609	$ 3,609
Interest rate (as a percent)	6.52%	1.95%
Trust Preferred Securities [Member] | Community National Statutory Trust III [Member] | London Interbank Offered Rate (LIBOR)
Variable interest rate (as a percent)	1.75%
Trust Preferred Securities [Member] | Guaranty Bankshares Statutory Trust I [Member] | London Interbank Offered Rate (LIBOR)
Variable interest rate (as a percent)	1.75%
Trust Preferred Securities [Member] | Guaranty Federal Statutory Trust II [Member]
Date issued	December 2005
Aggregate principal amount	$ 10,310
Interest rate (as a percent)	6.14%
Trust Preferred Securities [Member] | Guaranty Federal Statutory Trust II [Member] | London Interbank Offered Rate (LIBOR)
Variable interest rate (as a percent)	1.45%