Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Condensed Consolidated Balance Sheets
Accounts receivable, allowances (in dollars)	$ 2,449	$ 2,102
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized	10,000,000	10,000,000
Common Stock, shares issued	5,284,500	5,284,500
Common Stock, shares outstanding	4,498,223	4,454,829
Treasury stock, shares	786,277	829,671