Note 3 - Business Combinations (Details Textual) - USD ($) shares in Thousands, $ in Thousands			12 Months Ended
	Oct. 09, 2024	Jul. 01, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill			$ 85,634	$ 46,783
Business Combination, Acquisition Related Costs			9,974	0	$ 2,540
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest			59,929	35,843	31,146	$ 31,572
Metro Phoenix Bank [Member]
Business Combination, Consideration Transferred		$ 64,000
Goodwill		15,129
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans		270,403
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits		353,685
Business Combination, Acquisition Related Costs					$ 2,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		403,248
Metro Phoenix Bank [Member] | Core Deposits [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		$ 7,592
HMN Financial Inc. (HNMF) [Member]
Business Combination, Consideration Transferred	$ 123,600
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	33,500
Goodwill	38,851
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans	785,439
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	$ 957,849
Business Combination, Acquisition Related Costs			$ 10,000	$ 0
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)	5,550
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	$ 1,063,872
Business Acquisition, Goodwill, Amount Not Expected to Be Tax Deductible	38,900
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	$ 7,300