Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) - $ / shares	Sep. 30, 2016	Dec. 31, 2015
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)	7,545,167	7,290,167
Common stock, outstanding (in shares)	7,149,559	6,918,579
Treasury stock, shares (in shares)	395,608	371,588