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Note 2 - Investment Securities - Investment Securities Available for Sale (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Number of investment positions - less than twelve months 7 17
Fair value - less than twelve months $ 11,701 $ 8,484
Gross unrealized losses - less than twelve months $ 28 $ 27
Number of investment positions - more than twelve months 158 192
Fair value - more than twelve months $ 167,261 $ 195,091
Gross unrealized losses - more than twelve months $ 3,583 $ 5,431
Number of investment positions 165 209
Fair value $ 178,962 $ 203,575
Gross unrealized losses $ 3,611 $ 5,458
Agency Collateralized Mortgage Obligations [Member]    
Number of investment positions - less than twelve months 5 4
Fair value - less than twelve months $ 8,429 $ 2,870
Gross unrealized losses - less than twelve months $ 24 $ 1
Number of investment positions - more than twelve months 20 24
Fair value - more than twelve months $ 11,313 $ 12,168
Gross unrealized losses - more than twelve months $ 327 $ 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 91 97
Fair value - more than twelve months $ 85,872 $ 89,680
Gross unrealized losses - more than twelve months $ 2,365 $ 3,476
US Government Agencies Debt Securities [Member]    
Number of investment positions - less than twelve months 1 1
Fair value - less than twelve months $ 2,997 $ 499
Gross unrealized losses - less than twelve months $ 3 $ 1
Number of investment positions - more than twelve months 16 22
Fair value - more than twelve months $ 52,946 $ 67,927
Gross unrealized losses - more than twelve months $ 736 $ 1,015
Municipal Notes [Member]    
Number of investment positions - less than twelve months 1 11
Fair value - less than twelve months $ 275 $ 3,552
Gross unrealized losses - less than twelve months $ 1 $ 12
Number of investment positions - more than twelve months 31 49
Fair value - more than twelve months $ 17,130 $ 25,316
Gross unrealized losses - more than twelve months $ 155 $ 559