Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Stockholders' equity:
Common stock, par value	$ 0.1	$ 0.1
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	11,392,236	11,306,650
Treasury stock, shares	42,600	42,600