Interim Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Stockholders' equity:
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	11,905,879	11,902,729
Common stock, shares outstanding	11,905,879	11,902,729
Treasury stock, shares	42,600	42,600