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Note 2 - Investment Securities - Investment Securities Available for Sale (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Number of investment positions - less than twelve months 23 17
Fair value - less than twelve months $ 21,499 $ 8,484
Gross unrealized losses - less than twelve months $ 228 $ 27
Number of investment positions - more than twelve months 88 192
Fair value - more than twelve months $ 112,800 $ 195,091
Gross unrealized losses - more than twelve months $ 1,046 $ 5,431
Number of investment positions 111 209
Fair value $ 134,299 $ 203,575
Gross unrealized losses $ 1,274 $ 5,458
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Number of investment positions - less than twelve months 10 1
Fair value - less than twelve months $ 4,951 $ 1,563
Gross unrealized losses - less than twelve months $ 7 $ 13
Number of investment positions - more than twelve months 60 97
Fair value - more than twelve months $ 62,392 $ 89,680
Gross unrealized losses - more than twelve months $ 803 $ 3,476
Agency Collateralized Mortgage Obligations [Member]    
Number of investment positions - less than twelve months 11 4
Fair value - less than twelve months $ 14,247 $ 2,870
Gross unrealized losses - less than twelve months $ 219 $ 1
Number of investment positions - more than twelve months 16 24
Fair value - more than twelve months $ 7,692 $ 12,168
Gross unrealized losses - more than twelve months $ 88 $ 381
US Government Agencies Debt Securities [Member]    
Number of investment positions - less than twelve months 1 1
Fair value - less than twelve months $ 1,999 $ 499
Gross unrealized losses - less than twelve months $ 1 $ 1
Number of investment positions - more than twelve months 11 22
Fair value - more than twelve months $ 42,616 $ 67,927
Gross unrealized losses - more than twelve months $ 155 $ 1,015
US States and Political Subdivisions Debt Securities [Member]    
Number of investment positions - less than twelve months 1 11
Fair value - less than twelve months $ 302 $ 3,552
Gross unrealized losses - less than twelve months $ 1 $ 12
Number of investment positions - more than twelve months 1 49
Fair value - more than twelve months $ 100 $ 25,316
Gross unrealized losses - more than twelve months $ 559