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Note 3 - Securities (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Proceeds from Sale of Debt Securities, Available-for-sale $ 0 $ 0 $ 0 $ 0  
Other than Temporary Impairment Losses, Investments, Total     $ 0   $ 0