Note 7 - Derivatives and Hedging Activities - Summary of Interest Rate Cap Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Derivative Assets	$ 177,631	$ 222,220
Interest rate swap
Derivative Assets	166,614	221,055
Interest rate cap
Derivative Assets	2,213	238
Cash Flow Hedging | Interest rate swap
Derivative Assets	477
Cash Flow Hedging | Interest rate cap
Derivative Assets	8,327	927
Designated as Hedging Instrument | Other Assets | Cash Flow Hedging | Derivative Instrument One Maturing 2023 [Member]
Notional Amount	25,000
Fair Value - Asset		5
Fair Value - Liability	$ (50)
Designated as Hedging Instrument | Other Assets | Cash Flow Hedging | Derivative Instrument One Maturing 2023 [Member] | London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.75%
Designated as Hedging Instrument | Other Assets | Cash Flow Hedging | Derivative Instrument Two Maturing 2023 [Member]
Notional Amount	$ 50,000
Fair Value - Asset		11
Designated as Hedging Instrument | Other Assets | Cash Flow Hedging | Derivative Instrument Two Maturing 2023 [Member] | London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.57%
Designated as Hedging Instrument | Other Assets | Cash Flow Hedging | Derivative Instrument Four Maturing 2023 [Member]
Notional Amount	$ 25,000
Fair Value - Asset		5
Designated as Hedging Instrument | Other Assets | Cash Flow Hedging | Derivative Instrument Four Maturing 2023 [Member] | London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.80%
Designated as Hedging Instrument | Other Assets | Cash Flow Hedging | Derivative Instrument One Maturing 2024 [Member]
Notional Amount	$ 25,000
Fair Value - Asset	$ 714	60
Designated as Hedging Instrument | Other Assets | Cash Flow Hedging | Derivative Instrument One Maturing 2024 [Member] | London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.75%
Designated as Hedging Instrument | Other Assets | Cash Flow Hedging | Derivative Instrument Two Maturing 2024 [Member]
Notional Amount	$ 50,000
Fair Value - Asset	$ 1,566	125
Designated as Hedging Instrument | Other Assets | Cash Flow Hedging | Derivative Instrument Two Maturing 2024 [Member] | London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.57%
Designated as Hedging Instrument | Other Assets | Cash Flow Hedging | Derivative Instrument Four Maturing 2024 [Member]
Notional Amount	$ 25,000
Fair Value - Asset	$ 783	62
Designated as Hedging Instrument | Other Assets | Cash Flow Hedging | Derivative Instrument Four Maturing 2024 [Member] | London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.80%
Designated as Hedging Instrument | Other Assets | Cash Flow Hedging | Derivative Instrument One Maturing 2025 [Member]
Notional Amount	$ 25,000
Fair Value - Asset	$ 1,264	161
Designated as Hedging Instrument | Other Assets | Cash Flow Hedging | Derivative Instrument One Maturing 2025 [Member] | London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.75%
Designated as Hedging Instrument | Other Assets | Cash Flow Hedging | Derivative Instrument Two Maturing 2025 [Member]
Notional Amount	$ 50,000
Fair Value - Asset	$ 2,700	332
Designated as Hedging Instrument | Other Assets | Cash Flow Hedging | Derivative Instrument Two Maturing 2025 [Member] | London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.57%
Designated as Hedging Instrument | Other Assets | Cash Flow Hedging | Derivative Instrument Four Maturing 2025 [Member]
Notional Amount	$ 25,000
Fair Value - Asset	$ 1,350	166
Designated as Hedging Instrument | Other Assets | Cash Flow Hedging | Derivative Instrument Four Maturing 2025 [Member] | London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.80%
Designated as Hedging Instrument | Other Assets | Cash Flow Hedging | Interest rate cap
Notional Amount	$ 300,000
Fair Value - Asset	8,327	927
Designated as Hedging Instrument | Other Liabilities. | Cash Flow Hedging | Interest rate swap
Notional Amount	49,310
Fair Value - Liability	(2,284)	(3,991)
Designated as Hedging Instrument | Other Liabilities. | Cash Flow Hedging | QCR Holdings Statutory Trust II
Notional Amount	10,000
Fair Value - Liability	$ (464)	(1,035)
Receive Rate	6.52%
Pay Rate	5.85%
Designated as Hedging Instrument | Other Liabilities. | Cash Flow Hedging | QCR Holdings Statutory Trust III
Notional Amount	$ 8,000
Fair Value - Liability	$ (372)	(828)
Receive Rate	6.52%
Pay Rate	5.85%
Designated as Hedging Instrument | Other Liabilities. | Cash Flow Hedging | QCR Holdings Statutory Trust V
Notional Amount	$ 10,000
Fair Value - Liability	$ (459)	(996)
Receive Rate	4.06%
Pay Rate	4.54%
Designated as Hedging Instrument | Other Liabilities. | Cash Flow Hedging | Community National Statutory Trust II
Notional Amount	$ 3,000
Fair Value - Liability	$ (140)	(309)
Receive Rate	6.92%
Pay Rate	5.17%
Designated as Hedging Instrument | Other Liabilities. | Cash Flow Hedging | Community National Statutory Trust III
Notional Amount	$ 3,500
Fair Value - Liability	$ (163)	(360)
Receive Rate	5.04%
Pay Rate	4.75%
Designated as Hedging Instrument | Other Liabilities. | Cash Flow Hedging | Guaranty Bankshares Statutory Trust I
Notional Amount	$ 4,500
Fair Value - Liability	$ (209)	(463)
Receive Rate	5.04%
Pay Rate	4.75%
Designated as Hedging Instrument | Other Liabilities. | Cash Flow Hedging | Guaranty Statutory Trust II
Notional Amount	$ 10,310
Fair Value - Liability	$ (477)
Receive Rate	6.14%
Pay Rate	4.09%
Designated as Hedging Instrument | Derivative Assets. | Cash Flow Hedging
Notional Amount	$ 300,000
Fair Value - Liability	(35,631)
Designated as Hedging Instrument | Derivative Liabilities | Cash Flow Hedging
Fair Value - Liability		(89)
Designated as Hedging Instrument | Derivative Liabilities | Cash Flow Hedging | Loans, one
Notional Amount	35,000
Fair Value - Liability	$ (5,646)	(17)
Receive Rate	1.40%
Pay Rate	4.12%
Designated as Hedging Instrument | Derivative Liabilities | Cash Flow Hedging | Loans, two
Notional Amount	$ 50,000
Fair Value - Liability	$ (8,066)	(25)
Receive Rate	1.40%
Pay Rate	4.12%
Designated as Hedging Instrument | Derivative Liabilities | Cash Flow Hedging | Loans, three
Notional Amount	$ 40,000
Fair Value - Asset	$ 6,464
Fair Value - Liability		(34)
Receive Rate	1.40%
Pay Rate	4.12%
Designated as Hedging Instrument | Derivative Liabilities | Cash Flow Hedging | Loans, four
Notional Amount	$ 25,000
Fair Value - Liability	$ (4,018)	(13)
Receive Rate	1.30%
Pay Rate	4.12%
Designated as Hedging Instrument | Derivative Liabilities | Cash Flow Hedging | Loan five
Notional Amount	$ 15,000
Fair Value - Liability	$ (1,144)
Receive Rate	1.91%
Pay Rate	4.12%
Designated as Hedging Instrument | Derivative Liabilities | Cash Flow Hedging | Loan six
Notional Amount	$ 50,000
Fair Value - Liability	$ (3,812)
Receive Rate	1.91%
Pay Rate	4.12%
Designated as Hedging Instrument | Derivative Liabilities | Cash Flow Hedging | Loan seven
Notional Amount	$ 35,000
Fair Value - Liability	$ (2,669)
Receive Rate	1.91%
Pay Rate	4.12%
Designated as Hedging Instrument | Derivative Liabilities | Cash Flow Hedging | Loan eight
Notional Amount	$ 50,000
Fair Value - Liability	$ (3,812)
Receive Rate	1.91%
Pay Rate	4.12%
Non Designated
Derivative Assets	$ 2,213	$ 238
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets.	Other assets.
Non Designated | Derivative Instrument One Maturing 2023 [Member]
Derivative Assets	$ 3	$ 3
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets.	Other assets.
Non Designated | Derivative Instrument One Maturing 2024 [Member]
Derivative Assets	$ 822	$ 62
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets.	Other assets.
Non Designated | Derivative Instrument One Maturing 2025 [Member]
Derivative Assets	$ 1,388	$ 173
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets.	Other assets.
Non Designated | Interest rate swap
Derivative Assets	$ 166,614	$ 221,055
Non Designated | Other Assets
Notional Amount	75,000
Non Designated | Other Assets | Derivative Instrument One Maturing 2023 [Member]
Notional Amount	$ 25,000
Non Designated | Other Assets | Derivative Instrument One Maturing 2023 [Member] | London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.90%
Non Designated | Other Assets | Derivative Instrument One Maturing 2024 [Member]
Notional Amount	$ 25,000
Non Designated | Other Assets | Derivative Instrument One Maturing 2024 [Member] | London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.90%
Non Designated | Other Assets | Derivative Instrument One Maturing 2025 [Member]
Notional Amount	$ 25,000
Non Designated | Other Assets | Derivative Instrument One Maturing 2025 [Member] | London Interbank Offered Rate (LIBOR)
Derivative, Basis Spread on Variable Rate	1.90%