Note 8 - Derivatives and Hedging Activities - Summary of Interest Rate Cap Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Derivative Assets	$ 187,341	$ 177,631
Derivative Liabilities	(215,735)	(200,701)
Hedged Derivatives | Cash Flow Hedges
Notional Amount	49,310
Derivative Assets	1,689	2,284
Derivative Liabilities	(30,407)	(35,631)
Hedged Derivatives | Cash Flow Hedges | Deposits, one
Notional Amount	$ 25,000
Derivative Assets		(50)
Hedged Derivatives | Cash Flow Hedges | Deposits, one | London Interbank Offered Rate (LIBOR)
Strike Rate	1.75%
Hedged Derivatives | Cash Flow Hedges | Deposits, one
Notional Amount	$ 25,000
Derivative Assets	$ (79)	714
Hedged Derivatives | Cash Flow Hedges | Deposits, one | London Interbank Offered Rate (LIBOR)
Strike Rate	1.75%
Hedged Derivatives | Cash Flow Hedges | Deposits, two
Notional Amount	$ 50,000
Derivative Assets		1,566
Hedged Derivatives | Cash Flow Hedges | Deposits, two | London Interbank Offered Rate (LIBOR)
Strike Rate	1.57%
Hedged Derivatives | Cash Flow Hedges | Deposits, three
Notional Amount	$ 25,000
Derivative Assets		783
Hedged Derivatives | Cash Flow Hedges | Deposits, three | London Interbank Offered Rate (LIBOR)
Strike Rate	1.80%
Hedged Derivatives | Cash Flow Hedges | Deposits, five
Notional Amount	$ 25,000
Derivative Assets	$ 672	1,264
Hedged Derivatives | Cash Flow Hedges | Deposits, five | London Interbank Offered Rate (LIBOR)
Strike Rate	1.75%
Hedged Derivatives | Cash Flow Hedges | Deposits, six
Notional Amount	$ 50,000
Derivative Assets	$ 1,503	2,700
Hedged Derivatives | Cash Flow Hedges | Deposits, six | London Interbank Offered Rate (LIBOR)
Strike Rate	1.57%
Hedged Derivatives | Cash Flow Hedges | Deposits, seven
Notional Amount	$ 25,000
Derivative Assets	$ 751	1,350
Hedged Derivatives | Cash Flow Hedges | Deposits, seven | London Interbank Offered Rate (LIBOR)
Strike Rate	1.80%
Hedged Derivatives | Cash Flow Hedges | Interest rate swaps
Derivative Assets	$ 1,689	477
Derivative Liabilities	(30,407)	(33,824)
Hedged Derivatives | Cash Flow Hedges | QCR Holdings Statutory Trust II
Notional Amount	$ 10,000
Receive Rate	8.44%
Pay Rate	5.85%
Derivative Assets	$ 341	464
Hedged Derivatives | Cash Flow Hedges | QCR Holdings Statutory Trust III
Notional Amount	$ 8,000
Receive Rate	8.44%
Pay Rate	5.85%
Derivative Assets	$ 272	372
Hedged Derivatives | Cash Flow Hedges | QCR Holdings Statutory Trust V
Notional Amount	$ 10,000
Receive Rate	7.21%
Pay Rate	4.54%
Derivative Assets	$ 335	459
Hedged Derivatives | Cash Flow Hedges | Community National Statutory Trust II
Notional Amount	$ 3,000
Receive Rate	7.80%
Pay Rate	5.17%
Derivative Assets	$ 101	140
Hedged Derivatives | Cash Flow Hedges | Community National Statutory Trust III
Notional Amount	$ 3,500
Receive Rate	7.40%
Pay Rate	4.75%
Derivative Assets	$ 118	163
Hedged Derivatives | Cash Flow Hedges | Guaranty Bankshares Statutory Trust I
Notional Amount	$ 4,500
Receive Rate	7.40%
Pay Rate	4.75%
Derivative Assets	$ 152	209
Hedged Derivatives | Cash Flow Hedges | Guaranty Statutory Trust II
Notional Amount	$ 10,310
Receive Rate	7.09%
Pay Rate	4.09%
Derivative Assets	$ 370	477
Hedged Derivatives | Cash Flow Hedges | Loans, one
Receive Rate	1.40%
Pay Rate	5.45%
Derivative Liabilities	$ (5,004)	(5,646)
Hedged Derivatives | Cash Flow Hedges | Loans, two
Receive Rate	1.40%
Pay Rate	5.45%
Derivative Liabilities	$ (7,149)	(8,066)
Hedged Derivatives | Cash Flow Hedges | Loans, three
Receive Rate	1.40%
Pay Rate	5.45%
Derivative Liabilities	$ (5,730)	(6,464)
Hedged Derivatives | Cash Flow Hedges | Loans, four
Receive Rate	1.30%
Pay Rate	5.35%
Derivative Liabilities	$ (3,696)	(4,018)
Hedged Derivatives | Cash Flow Hedges | Loan five
Receive Rate	1.91%
Pay Rate	5.45%
Derivative Liabilities	$ (868)	(1,144)
Hedged Derivatives | Cash Flow Hedges | Loan six
Receive Rate	1.91%
Pay Rate	5.45%
Derivative Liabilities	$ (2,892)	(3,812)
Hedged Derivatives | Cash Flow Hedges | Loan seven
Receive Rate	1.91%
Pay Rate	5.45%
Derivative Liabilities	$ (2,024)	(2,669)
Hedged Derivatives | Cash Flow Hedges | Loan eight
Receive Rate	1.91%
Pay Rate	5.45%
Derivative Liabilities	$ (3,044)	(3,812)
Hedged Derivatives | Cash Flow Hedges | Interest rate caps
Notional Amount	225,000
Derivative Assets	2,847	8,327
Hedged Derivatives | Derivative Assets.
Notional Amount	325,000
Fair Value - Liability	(3,308)
Hedged Derivatives | Derivative Assets. | Loan nine
Notional Amount	$ 25,000
Receive Rate	5.35%
Pay Rate	4.38%
Fair Value - Liability	$ (195)
Hedged Derivatives | Derivative Assets. | Loan ten
Notional Amount	$ 30,000
Receive Rate	5.35%
Pay Rate	4.21%
Fair Value - Liability	$ (293)
Hedged Derivatives | Derivative Assets. | Loan eleven
Notional Amount	$ 32,500
Receive Rate	5.35%
Pay Rate	4.08%
Fair Value - Liability	$ (364)
Hedged Derivatives | Derivative Assets. | Loan twelve
Notional Amount	$ 32,500
Receive Rate	5.35%
Pay Rate	3.98%
Fair Value - Liability	$ (397)
Hedged Derivatives | Derivative Assets. | Loan thirteen
Notional Amount	$ 30,000
Receive Rate	5.35%
Pay Rate	3.90%
Fair Value - Liability	$ (388)
Hedged Derivatives | Derivative Assets. | Loan fourteen
Notional Amount	$ 15,000
Receive Rate	5.35%
Pay Rate	4.38%
Fair Value - Liability	$ (117)
Hedged Derivatives | Derivative Assets. | Loan fifteen
Notional Amount	$ 15,000
Receive Rate	5.35%
Pay Rate	4.21%
Fair Value - Liability	$ (146)
Hedged Derivatives | Derivative Assets. | Loan sixteen
Notional Amount	$ 15,000
Receive Rate	5.35%
Pay Rate	4.08%
Fair Value - Liability	$ (168)
Hedged Derivatives | Derivative Assets. | Loan seventeen
Notional Amount	$ 15,000
Receive Rate	5.35%
Pay Rate	3.98%
Fair Value - Liability	$ (183)
Hedged Derivatives | Derivative Assets. | Loan eighteen
Notional Amount	$ 15,000
Receive Rate	5.35%
Pay Rate	3.90%
Fair Value - Liability	$ (194)
Hedged Derivatives | Derivative Assets. | Loan nineteen
Notional Amount	$ 15,000
Receive Rate	5.35%
Pay Rate	4.60%
Fair Value - Liability	$ (69)
Hedged Derivatives | Derivative Assets. | Loan twenty
Notional Amount	$ 20,000
Receive Rate	5.35%
Pay Rate	4.38%
Fair Value - Liability	$ (140)
Hedged Derivatives | Derivative Assets. | Loan twenty one
Notional Amount	$ 20,000
Receive Rate	5.35%
Pay Rate	4.21%
Fair Value - Liability	$ (176)
Hedged Derivatives | Derivative Assets. | Loan twenty two
Notional Amount	$ 20,000
Receive Rate	5.35%
Pay Rate	4.08%
Fair Value - Liability	$ (202)
Hedged Derivatives | Derivative Assets. | Loan twenty three
Notional Amount	$ 25,000
Receive Rate	5.35%
Pay Rate	3.98%
Fair Value - Liability	$ (276)
Hedged Derivatives | Derivative Liabilities | Cash Flow Hedges
Notional Amount	300,000
Hedged Derivatives | Derivative Liabilities | Cash Flow Hedges | Loans, one
Notional Amount	35,000
Hedged Derivatives | Derivative Liabilities | Cash Flow Hedges | Loans, two
Notional Amount	50,000
Hedged Derivatives | Derivative Liabilities | Cash Flow Hedges | Loans, three
Notional Amount	40,000
Hedged Derivatives | Derivative Liabilities | Cash Flow Hedges | Loans, four
Notional Amount	25,000
Hedged Derivatives | Derivative Liabilities | Cash Flow Hedges | Loan five
Notional Amount	15,000
Hedged Derivatives | Derivative Liabilities | Cash Flow Hedges | Loan six
Notional Amount	50,000
Hedged Derivatives | Derivative Liabilities | Cash Flow Hedges | Loan seven
Notional Amount	35,000
Hedged Derivatives | Derivative Liabilities | Cash Flow Hedges | Loan eight
Notional Amount	50,000
Unhedged Derivatives
Notional Amount	75,000
Derivative Assets	951	2,213
Unhedged Derivatives | Deposits, one
Notional Amount	25,000
Derivative Assets		3
Unhedged Derivatives | Deposits, one
Notional Amount	25,000
Derivative Assets	79	822
Unhedged Derivatives | Deposits, five
Notional Amount	25,000
Derivative Assets	872	1,388
Unhedged Derivatives | Interest rate swaps
Derivative Assets	181,854	166,614
Derivative Liabilities	(181,854)	(166,614)
Unhedged Derivatives | Interest rate caps
Derivative Assets	$ 951	$ 2,213
Unhedged Derivatives | Other Assets | Deposits, one | London Interbank Offered Rate (LIBOR)
Strike Rate	1.90%
Unhedged Derivatives | Other Assets | Deposits, one | London Interbank Offered Rate (LIBOR)
Strike Rate	1.90%
Unhedged Derivatives | Other Assets | Deposits, five | London Interbank Offered Rate (LIBOR)
Strike Rate	1.90%