Note 14 - Junior Subordinated Debentures - Junior Subordinated Debentures (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Junior subordinated debentures	$ 48,731	$ 48,602
Junior subordinated debentures	(1,789)	(1,918)
Note Payable to QCR Holdings Capital Trust II [Member]
Junior subordinated debentures	10,310	10,310
Note Payable to Trust III [Member]
Junior subordinated debentures	8,248	8,248
Note Payable to Trust V [Member]
Junior subordinated debentures	10,310	10,310
Community National Trust II [Member]
Junior subordinated debentures	3,093	3,093
Community National Trust III [Member]
Junior subordinated debentures	3,609	3,609
Note Payable to Guaranty Bankshares Statutory Trust I [Member]
Junior subordinated debentures	4,640	4,640
Note Payable to Guaranty Federal Statutory Trust II [Member]
Junior subordinated debentures	$ 10,310	$ 10,310