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Note 3 - Available-for-sale Securities - Investment Securities in a Continuous Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale securities in continuous loss position, less than 12 months, fair value $ 5,969 $ 7,817
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss 144 88
Available-for-sale securities in continuous loss position, 12 months or more, fair value 9,317 16,489
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss 87 231
Available-for-sale securities in continuous loss position, fair value 15,286 24,306
Available-for-sale securities in continuous loss position, unrealized loss 231 319
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Available-for-sale securities in continuous loss position, less than 12 months, fair value 5,969 2,863
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss 144 42
Available-for-sale securities in continuous loss position, 12 months or more, fair value 3,356 10,550
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss 48 170
Available-for-sale securities in continuous loss position, fair value 9,325 13,413
Available-for-sale securities in continuous loss position, unrealized loss 192 212
US Government Agencies Debt Securities [Member]    
Available-for-sale securities in continuous loss position, less than 12 months, fair value   4,954
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss   46
Available-for-sale securities in continuous loss position, 12 months or more, fair value  
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss  
Available-for-sale securities in continuous loss position, fair value   4,954
Available-for-sale securities in continuous loss position, unrealized loss   46
Corporate Debt Securities [Member]    
Available-for-sale securities in continuous loss position, less than 12 months, fair value
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss
Available-for-sale securities in continuous loss position, 12 months or more, fair value 5,961 5,939
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss 39 61
Available-for-sale securities in continuous loss position, fair value 5,961 5,939
Available-for-sale securities in continuous loss position, unrealized loss $ 39 $ 61