Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts receivable, allowance	$ 319	$ 194
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)	18,867,768	18,785,055
Common stock, shares outstanding (in shares)	18,867,768	18,785,055