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Note 4 - Investment Securities - Scheduled Maturities of Investment Securities Available-for-sale and Held-to-maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Available-for-sale, maturing within one year, amortized cost $ 1,103    
Available-for-sale, maturing within one year, estimated fair value 1,104    
Held-to-maturity, maturing within one year, amortized cost 122    
Held-to-maturity, maturing within one year, estimated fair value 122    
Available-for-sale, maturing after one to five years, amortized cost 37,432    
Available-for-sale, maturing after one to five years, estimated fair value 36,946    
Held-to-maturity, maturing after one to five years, amortized cost 924    
Held-to-maturity, maturing after one to five years, estimated fair value 928    
Available-for-sale, maturing after five to ten years, amortized cost 52,928    
Available-for-sale, maturing after five to ten years, estimated fair value 52,004    
Held-to-maturity, maturing after five to ten years, amortized cost 10,235    
Held-to-maturity, maturity after five to ten years, estimated fair value 10,040    
Available-for-sale, maturing after ten years, amortized cost 37,769    
Available-for-sale, maturing after ten years, estimated fair value 37,131    
Held-to-maturity, maturing after ten years, amortized cost 9,559    
Held-to-maturity, maturing after ten years, estimated fair value 9,377    
Available-for-sale, amortized cost 129,232 $ 135,656  
Available-for-sale, estimated fair value 127,185 132,487  
Held-to-maturity, amortized cost 20,840 21,462 $ 20,840
Held-to-maturity, estimated fair value $ 20,467 $ 20,852 $ 20,467