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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ / shares in Thousands, $ in Thousands
Sep. 30, 2018
Dec. 31, 2017
 [1]
Accounts receivable, allowance for doubtful accounts $ 132 $ 168
Preferred stock, no par value (in dollars per share) $ 0 $ 0
Preferred stock, shares authorized (in shares) 1,250,000 1,250,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 250,000,000 250,000,000
Common stock, shares issued (in shares) 10,615,566 10,583,879
Common stock, shares outstanding (in shares) 10,615,566 10,583,879
[1] The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.