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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ / shares in Thousands, $ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accounts receivable, allowance $ 57 $ 319
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 43,000,000 43,000,000
Common stock, shares issued (in shares) 18,958,018 18,867,768
Common stock, shares outstanding (in shares) 18,958,018 18,867,768