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Note 2 - Investment Securities - Investment Securities Available for Sale (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Number of investment positions - less than twelve months 61 67
Fair value - less than twelve months $ 40,939 $ 62,680
Gross unrealized losses - less than twelve months $ 618 $ 590
Number of investment positions - more than twelve months 172 126
Fair value - more than twelve months $ 188,342 $ 159,337
Gross unrealized losses - more than twelve months $ 7,989 $ 3,391
Number of investment positions 233 193
Fair value $ 229,281 $ 222,017
Gross unrealized losses $ 8,607 $ 3,981
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Number of investment positions - less than twelve months 6 37
Fair value - less than twelve months $ 3,034 $ 37,570
Gross unrealized losses - less than twelve months $ 86 $ 400
Number of investment positions - more than twelve months 93 60
Fair value - more than twelve months $ 91,314 $ 74,960
Gross unrealized losses - more than twelve months $ 5,134 $ 1,853
Agency Collateralized Mortgage Obligations [Member]    
Number of investment positions - less than twelve months 16 6
Fair value - less than twelve months $ 19,019 $ 3,036
Gross unrealized losses - less than twelve months $ 187 $ 38
Number of investment positions - more than twelve months 22 18
Fair value - more than twelve months $ 11,613 $ 11,801
Gross unrealized losses - more than twelve months $ 557 $ 300
US Government Agencies Debt Securities [Member]    
Number of investment positions - less than twelve months 2 4
Fair value - less than twelve months $ 1,078 $ 11,119
Gross unrealized losses - less than twelve months $ 22 $ 69
Number of investment positions - more than twelve months 21 19
Fair value - more than twelve months $ 66,878 $ 57,909
Gross unrealized losses - more than twelve months $ 1,482 $ 916
Municipal Notes [Member]    
Number of investment positions - less than twelve months 37 20
Fair value - less than twelve months $ 17,808 $ 10,955
Gross unrealized losses - less than twelve months $ 323 $ 83
Number of investment positions - more than twelve months 36 29
Fair value - more than twelve months $ 18,537 $ 14,667
Gross unrealized losses - more than twelve months $ 816 $ 322