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Note 3 - Investment Securities - Investment Securities Available for Sale (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Number of investment positions - less than twelve months 16 24
Fair value - less than twelve months $ 13,489 $ 24,264
Gross unrealized losses - less than twelve months $ 25 $ 201
Number of investment positions - more than twelve months 4 75
Fair value - more than twelve months $ 1,589 $ 93,852
Gross unrealized losses - more than twelve months $ 12 $ 700
Number of investment positions 20 99
Fair value $ 15,078 $ 118,116
Gross unrealized losses $ 37 $ 901
Agency Collateralized Mortgage Obligations [Member]    
Number of investment positions - less than twelve months 12 13
Fair value - less than twelve months $ 6,189 $ 14,749
Gross unrealized losses - less than twelve months $ 18 $ 157
Number of investment positions - more than twelve months 4 15
Fair value - more than twelve months $ 1,589 $ 7,113
Gross unrealized losses - more than twelve months $ 12 $ 64
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Number of investment positions - less than twelve months   5
Fair value - less than twelve months   $ 723
Gross unrealized losses - less than twelve months   $ 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
US Government Agencies Debt Securities [Member]    
Number of investment positions - less than twelve months 2 2
Fair value - less than twelve months $ 5,997 $ 5,551
Gross unrealized losses - less than twelve months $ 3 $ 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 2  
Fair value - less than twelve months $ 1,303  
Gross unrealized losses - less than twelve months $ 4  
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