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Note 4 - Cash (Details Textual) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Oct. 01, 2017
Dec. 31, 2016
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance $ 25,454 $ 18,330 $ 14,607 $ 10,629