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Note 2 - Investment Securities - Investment Securities Available for Sale (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Number of investment positions - less than twelve months 14 24
Fair value - less than twelve months $ 19,145 $ 24,264
Gross unrealized losses - less than twelve months $ 99 $ 201
Number of investment positions - more than twelve months 3 75
Fair value - more than twelve months $ 1,385 $ 93,852
Gross unrealized losses - more than twelve months $ 16 $ 700
Number of investment positions 17 99
Fair value $ 20,530 $ 118,116
Gross unrealized losses $ 115 $ 901
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Number of investment positions - less than twelve months 3 5
Fair value - less than twelve months $ 6,122 $ 723
Gross unrealized losses - less than twelve months $ 26 $ 2
Number of investment positions - more than twelve months   50
Fair value - more than twelve months   $ 49,033
Gross unrealized losses - more than twelve months   $ 574
Agency Collateralized Mortgage Obligations [Member]    
Number of investment positions - less than twelve months 7 13
Fair value - less than twelve months $ 5,533 $ 14,749
Gross unrealized losses - less than twelve months $ 37 $ 157
Number of investment positions - more than twelve months 3 15
Fair value - more than twelve months $ 1,385 $ 7,113
Gross unrealized losses - more than twelve months $ 16 $ 64
US Government Agencies Debt Securities [Member]    
Number of investment positions - less than twelve months 1 2
Fair value - less than twelve months $ 4,998 $ 5,551
Gross unrealized losses - less than twelve months $ 2 $ 17
Number of investment positions - more than twelve months   10
Fair value - more than twelve months   $ 37,706
Gross unrealized losses - more than twelve months   $ 62
Municipal Notes [Member]    
Number of investment positions - less than twelve months 3  
Fair value - less than twelve months $ 2,492  
Gross unrealized losses - less than twelve months $ 34  
US States and Political Subdivisions Debt Securities [Member]    
Number of investment positions - less than twelve months   4
Fair value - less than twelve months   $ 3,241
Gross unrealized losses - less than twelve months   $ 25