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Note 6 - Securities - Available-for-sale Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Due in one year or less, amortized cost $ 6,611  
Due in one year or less, fair value 6,644  
Due from one year through five years. amortized cost 33,945  
Due from one year through five years, fair value 34,945  
Due from five years through ten years, amortized cost 43,596  
Due from five years through ten years, fair value 45,168  
Due after ten years, amortized cost 45,442  
Due after ten years, fair value 47,797  
Sub-total, amortized cost 129,594  
Sub-total, fair value 134,554  
Total, amortized cost 330,731 $ 342,278
Total, fair value 342,416 346,723
Residential Pass-Through Securities [Member]    
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, amortized cost 54,280  
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, fair value 55,752  
Total, amortized cost 54,280 58,875
Total, fair value 55,752 59,210
Residential Collateralized Mortgage Obligations [Member]    
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, amortized cost 101,130  
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, fair value 103,556  
Total, amortized cost 101,130 115,025
Total, fair value 103,556 $ 114,723
Commercial Mortgage-backed Securities [Member]    
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, amortized cost 45,727  
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, fair value $ 48,554