Note 1 - Nature of Operations - Summary of Significant Accounting Policies - (Details Textual) - USD ($)		12 Months Ended
	Mar. 01, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2023	Feb. 28, 2022	Mar. 31, 2021	Mar. 22, 2021
Assets, Total		$ 6,584,550,000	$ 5,990,460,000
Liabilities, Total		5,940,291,000	5,409,979,000
Deposits, Total		5,248,790,000	4,820,345,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total		0	0
Debt Securities, Trading, and Equity Securities, FV-NI, Total		0	0
Retained Earnings (Accumulated Deficit)		216,115,000	163,955,000
Unrecognized Tax Benefits		$ 0	0
Open Tax Year		2020 2021 2022 2023
Advertising Expense		$ 4,628,000	3,949,000	$ 2,712,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		$ 0	$ 0
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Retained Earnings (Accumulated Deficit)					$ (827,000)
Texas Citizens Bancorp [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)	2,069,532
Smith Shellnut Wilson, LLC [Member]
Assets under Management, Carrying Amount								$ 3,500,000,000
Assets, Total							$ 3,600,000
Liabilities, Total							$ 2,300,000
Texas Citizens Bancorp [Member]
Assets, Total						$ 534,200,000
Loans and Leases Receivable, Net of Deferred Income						349,500,000
Deposits, Total						$ 477,200,000