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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Accounts receivable, allowances $ 234 $ 243
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 3,000,000 3,000,000
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 37,000,000 37,000,000
Common stock, shares issued 20,033,526 19,748,321
Treasury stock, at cost 1,452,810 1,431,139