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Note 2 - Investment Securities - Investment Securities Available for Sale (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Number of investment positions - less than twelve months 3 17
Fair value - less than twelve months $ 3,792 $ 8,484
Gross unrealized losses - less than twelve months $ 33 $ 27
Number of investment positions - more than twelve months 112 192
Fair value - more than twelve months $ 130,426 $ 195,091
Gross unrealized losses - more than twelve months $ 1,170 $ 5,431
Number of investment positions 115 209
Fair value $ 134,218 $ 203,575
Gross unrealized losses $ 1,203 $ 5,458
Agency Collateralized Mortgage Obligations [Member]    
Number of investment positions - less than twelve months 3 4
Fair value - less than twelve months $ 3,792 $ 2,870
Gross unrealized losses - less than twelve months $ 33 $ 1
Number of investment positions - more than twelve months 20 24
Fair value - more than twelve months $ 10,939 $ 12,168
Gross unrealized losses - more than twelve months $ 134 $ 381
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Number of investment positions - less than twelve months   1
Fair value - less than twelve months   $ 1,563
Gross unrealized losses - less than twelve months   $ 13
Number of investment positions - more than twelve months 74 97
Fair value - more than twelve months $ 72,485 $ 89,680
Gross unrealized losses - more than twelve months $ 790 $ 3,476
US Government Agencies Debt Securities [Member]    
Number of investment positions - less than twelve months   1
Fair value - less than twelve months   $ 499
Gross unrealized losses - less than twelve months   $ 1
Number of investment positions - more than twelve months 13 22
Fair value - more than twelve months $ 45,138 $ 67,927
Gross unrealized losses - more than twelve months $ 240 $ 1,015
US States and Political Subdivisions Debt Securities [Member]    
Number of investment positions - less than twelve months   11
Fair value - less than twelve months   $ 3,552
Gross unrealized losses - less than twelve months   $ 12
Number of investment positions - more than twelve months 5 49
Fair value - more than twelve months $ 1,864 $ 25,316
Gross unrealized losses - more than twelve months $ 6 $ 559