Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Stockholders' equity:
Series A Preferred stock, par value (in dollars per share)	$ 0.50	$ 0.50
Series A Preferred stock, authorized (in shares)	700,000	700,000
Series A Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	10,000,000	10,000,000
Common stock, issued (in shares)	7,290,167	7,062,209
Common stock, outstanding (in shares)	6,918,579	6,730,622
Treasury stock, shares (in shares)	371,588	331,587