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Note 3 - Investment Securities - Investment Securities Available for Sale (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Number of investment positions - less than twelve months 17 67
Fair value - less than twelve months $ 8,484 $ 62,680
Gross unrealized losses - less than twelve months $ 27 $ 590
Number of investment positions - more than twelve months 192 126
Fair value - more than twelve months $ 195,091 $ 159,337
Gross unrealized losses - more than twelve months $ 5,431 $ 3,391
Number of investment positions 209 193
Fair value $ 203,575 $ 222,017
Gross unrealized losses $ 5,458 $ 3,981
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Number of investment positions - less than twelve months 1 37
Fair value - less than twelve months $ 1,563 $ 37,570
Gross unrealized losses - less than twelve months $ 13 $ 400
Number of investment positions - more than twelve months 97 60
Fair value - more than twelve months $ 89,680 $ 74,960
Gross unrealized losses - more than twelve months $ 3,476 $ 1,853
Agency Collateralized Mortgage Obligations [Member]    
Number of investment positions - less than twelve months 4 6
Fair value - less than twelve months $ 2,870 $ 3,036
Gross unrealized losses - less than twelve months $ 1 $ 38
Number of investment positions - more than twelve months 24 18
Fair value - more than twelve months $ 12,168 $ 11,801
Gross unrealized losses - more than twelve months $ 381 $ 300
US Government Agencies Debt Securities [Member]    
Number of investment positions - less than twelve months 1 4
Fair value - less than twelve months $ 499 $ 11,119
Gross unrealized losses - less than twelve months $ 1 $ 69
Number of investment positions - more than twelve months 22 19
Fair value - more than twelve months $ 67,927 $ 57,909
Gross unrealized losses - more than twelve months $ 1,015 $ 916
Municipal Notes [Member]    
Number of investment positions - less than twelve months 11 20
Fair value - less than twelve months $ 3,552 $ 10,955
Gross unrealized losses - less than twelve months $ 12 $ 83
Number of investment positions - more than twelve months 49 29
Fair value - more than twelve months $ 25,316 $ 14,667
Gross unrealized losses - more than twelve months $ 559 $ 322