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Note 2 - Investment Securities - Investment Securities Available for Sale (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Number of investment positions - less than twelve months 88 67
Fair value - less than twelve months $ 67,345 $ 62,680
Gross unrealized losses - less than twelve months $ 1,673 $ 590
Number of investment positions - more than twelve months 129 126
Fair value - more than twelve months $ 157,983 $ 159,337
Gross unrealized losses - more than twelve months $ 5,730 $ 3,391
Number of investment positions 217 193
Fair value $ 225,328 $ 222,017
Gross unrealized losses $ 7,403 $ 3,981
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Number of investment positions - less than twelve months 36 37
Fair value - less than twelve months $ 31,683 $ 37,570
Gross unrealized losses - less than twelve months $ 962 $ 400
Number of investment positions - more than twelve months 63 60
Fair value - more than twelve months $ 75,048 $ 74,960
Gross unrealized losses - more than twelve months $ 3,383 $ 1,853
Agency Collateralized Mortgage Obligations [Member]    
Number of investment positions - less than twelve months 7 6
Fair value - less than twelve months $ 2,948 $ 3,036
Gross unrealized losses - less than twelve months $ 77 $ 38
Number of investment positions - more than twelve months 18 18
Fair value - more than twelve months $ 11,150 $ 11,801
Gross unrealized losses - more than twelve months $ 394 $ 300
US Government Agencies Debt Securities [Member]    
Number of investment positions - less than twelve months 4 4
Fair value - less than twelve months $ 11,047 $ 11,119
Gross unrealized losses - less than twelve months $ 132 $ 69
Number of investment positions - more than twelve months 19 19
Fair value - more than twelve months $ 57,501 $ 57,909
Gross unrealized losses - more than twelve months $ 1,315 $ 916
Municipal Notes [Member]    
Number of investment positions - less than twelve months 41 20
Fair value - less than twelve months $ 21,667 $ 10,955
Gross unrealized losses - less than twelve months $ 502 $ 83
Number of investment positions - more than twelve months 29 29
Fair value - more than twelve months $ 14,284 $ 14,667
Gross unrealized losses - more than twelve months $ 638 $ 322