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Note 10 - Business Combination (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 01, 2022
Amortization of Intangible Assets $ 265,000 $ 77,000    
Liberty Bancshares Inc [Member]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Including Goodwill 16,700,000      
Goodwill, Impairment Loss 0      
Amortization of Intangible Assets     $ 0  
Liberty Bancshares Inc [Member] | Core Deposits [Member]        
Finite-Lived Intangible Asset, Useful Life (Year)       10 years
Finite-Lived Intangible Assets, Gross 6,400,000      
Finite-Lived Intangible Assets, Accumulated Amortization $ 254,000