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Note 3 - Securities - Maturity of Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Due in one year or less, amortized cost  
Due in one year or less, fair value  
Due after one year through five years, amortized cost 4,547  
Due after one year through five years, fair value 4,597  
Due after five through ten years, amortized cost 30,848  
Due after five years through ten years, fair value 31,028  
Due after ten years, amortized cost 63,901  
Due after ten years, fair value 63,525  
Securities available-for-sale, amortized cost 141,695 $ 110,232
Securities available-for-sale, fair value 141,871 113,041
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities without maturity date, amortized cost 19,826  
Securities without maturity date, fair value 20,045  
Securities available-for-sale, amortized cost 19,826 16,151
Securities available-for-sale, fair value 20,045 16,581
Collateralized Mortgage Obligations [Member]    
Securities without maturity date, amortized cost 22,573  
Securities without maturity date, fair value 22,676  
Securities available-for-sale, amortized cost 22,573 15,658
Securities available-for-sale, fair value $ 22,676 $ 15,911