Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) - $ / shares	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	1,000,000	1,000,000
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Common stock, par value (usd per share)	$ 0.0017	$ 0.0017
Common stock, shares authorized (shares)	16,000,000	16,000,000
Common stock, shares issued (shares)	8,424,000	8,425,000
Common stock, shares outstanding (shares)	6,801,000	6,802,000
Treasury stock, shares (shares)	1,623,000	1,623,000